RHSA-2026:8822
Vulnerability from csaf_redhat - Published: 2026-04-17 18:54 - Updated: 2026-04-23 23:44Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
python3.11:
* python3.11-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-debug-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-devel-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-idle-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-libs-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-test-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-tkinter-3.11.15-4.hum1 (aarch64, x86_64)
* python3.11-3.11.15-4.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A vulnerability in Python’s os.path.expandvars() function that can cause performance degradation. When processing specially crafted, user-controlled input with nested environment variable patterns, the function exhibits quadratic time complexity, potentially leading to excessive CPU usage and denial of service (DoS) conditions. No code execution or data exposure occurs, so the impact is limited to performance slowdown.
4.0 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.
A zip file handling flaw has been discovered in the python standard library `zipfile` module. The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the 'zipfile' module compared to other ZIP implementations.
4.3 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Missing character filtering has been discovered in Python. When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
4.5 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in cpython. This vulnerability allows impacted availability via a quadratic algorithm in `xml.dom.minidom` methods, such as `appendChild()`, when building excessively nested documents due to a dependency on `_clear_id_cache()`
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
A flaw was found in the http.client module in the Python standard library. When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This issue allows a malicious server to cause the client to read large amounts of data into memory, potentially causing memory allocations errors, swapping, out-of-memory conditions or even system freezes.
6.8 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Since this vulnerability is triggered when no read amount is specified and the client defaults to using the potentially malicious Content-Length header, developers can mitigate this issue in their code by always imposing an explicit, safe limit on data reads.
Applications using the http.client.HTTPResponse.read function directly can ensure that read operations specify a byte limit:
~~~
...
max_safe_read = 10 * 1024 * 1024
data = response.read(max_safe_read)
...
~~~
A flaw was found in the plistlib module in the Python standard library. The amount of data to read from a Plist file is specified in the file itself. This issue allows a specially crafted Plist file to cause an application to allocate a large amount of memory, potentially resulting in allocations errors, swapping, out-of-memory conditions or even system freezes.
5.9 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Missing newline filtering has been discovered in Python. User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
4.8 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in the imaplib module in the Python standard library. The imaplib module does not reject control characters, such as newlines, in user-controlled input passed to IMAP commands. This issue allows an attacker to inject additional commands to be executed in the IMAP server.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
To mitigate this vulnerability, ensure that no data passed to the imaplib module contains newline or carriage return characters.
A flaw was found in the poplib module in the Python standard library. The poplib module does not reject control characters, such as newlines, in user-controlled input passed to POP3 commands. This issue allows an attacker to inject additional commands to be executed in the POP3 server.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
To mitigate this vulnerability, ensure that no data passed to the poplib module contains newline or carriage return characters.
Missing newline filtering has been discovered in Python. User-controlled header names and values containing newlines can allow injecting HTTP headers.
4.5 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in the email module in the Python standard library. When serializing an email message, the BytesGenerator class fails to properly quote newline characters for email headers. This issue is exploitable when the LiteralHeader class is used as it does not respect email folding rules, allowing an attacker to inject email headers and potentially modify message recipients or the email body, and spoof sender information.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
To mitigate this issue, applications accepting user-supplied data for email headers should sanitize the input by stripping or rejecting any strings containing carriage return or line feed characters, '\r' or '\n', respectively, preventing malicious sequences that could lead to header manipulation.
A flaw was found in Python. This vulnerability allows for the injection of extra information into HTTP communication. Specifically, the system does not properly prevent special characters (carriage return and line feed) from being included in HTTP client proxy tunnel headers or host fields.
4.5 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in CPython. This vulnerability allows a local user with low privileges to bypass security auditing mechanisms. The issue occurs because the SourcelessFileLoader component, responsible for handling older Python compiled files (.pyc), does not properly trigger system audit events. This oversight could enable malicious activities to go undetected, compromising the integrity of the system.
CWE-778 - Insufficient Logging
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A control character validation flaw has been discovered in the Python http.cookie module. The Morsel.update(), |= operator, and unpickling paths were not patched to resolve CVE-2026-0672, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
5.4 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A stack overflow flaw has been discovered in the python pyexpat module. When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs. This will result in a program crash.
5.9 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in the Python webbrowser.open() API. If a specially crafted URL containing "%action" is processed, an attacker could bypass a previous mitigation for CVE-2026-4519. This bypass allows for command injection into the underlying shell, potentially leading to arbitrary code execution.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
A flaw was found in Python. A malicious Python process could exploit the "profiling.sampling" module and "asyncio introspection capabilities" to read and write memory addresses within a privileged process. This vulnerability occurs when the privileged process connects to the malicious process via its remote debugging feature, potentially leading to information disclosure and arbitrary code execution. Successful exploitation requires repeated connections, which may cause instability in the connecting process.
6.0 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in Python's decompression modules, including `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile`. This vulnerability, a use-after-free, can occur if a program attempts to re-use a decompression object after a memory allocation error, especially when the system is experiencing high memory usage. Exploitation of this flaw could potentially allow an attacker to execute arbitrary code or access sensitive data. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.
8.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:8822
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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{
"category": "description",
"text": "A vulnerability in Python\u2019s os.path.expandvars() function that can cause performance degradation. When processing specially crafted, user-controlled input with nested environment variable patterns, the function exhibits quadratic time complexity, potentially leading to excessive CPU usage and denial of service (DoS) conditions. No code execution or data exposure occurs, so the impact is limited to performance slowdown.",
"title": "Vulnerability description"
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"text": "python: Quadratic complexity in os.path.expandvars() with user-controlled template",
"title": "Vulnerability summary"
},
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"category": "other",
"text": "This vulnerability is rated Low rather than Moderate because it only causes a performance inefficiency without affecting code execution, data integrity, or confidentiality. The flaw lies in the algorithmic complexity of os.path.expandvars(), which can become quadratic when processing crafted input containing repetitive or nested environment variable references. Exploitation requires the attacker to control the input string passed to this function, which is uncommon in secure applications. Moreover, the impact is limited to increased CPU utilization and potential slowdown, not system compromise or data manipulation. Since the issue does not introduce memory corruption, privilege escalation, or information disclosure risks, its overall impact scope and exploitability are minimal, justifying a Low severity rating.",
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"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2408891"
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},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6075"
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"category": "external",
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"integrityImpact": "NONE",
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"scope": "UNCHANGED",
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}
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"details": "Low"
}
],
"title": "python: Quadratic complexity in os.path.expandvars() with user-controlled template"
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{
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"id": "CWE-130",
"name": "Improper Handling of Length Parameter Inconsistency"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2402342"
}
],
"notes": [
{
"category": "description",
"text": "A zip file handling flaw has been discovered in the python standard library `zipfile` module. The \u0027zipfile\u0027 module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the \u0027zipfile\u0027 module compared to other ZIP implementations.",
"title": "Vulnerability description"
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{
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"text": "cpython: python: Python zipfile End of Central Directory (EOCD) Locator record offset not checked",
"title": "Vulnerability summary"
},
{
"category": "general",
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"title": "CVSS score applicability"
}
],
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-8291"
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{
"category": "external",
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"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
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"title": "cpython: python: Python zipfile End of Central Directory (EOCD) Locator record offset not checked"
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"id": "CWE-140",
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"ids": [
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"system_name": "Red Hat Bugzilla ID",
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}
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"text": "Missing character filtering has been discovered in Python. When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cpython: Missing character filtering in Python",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11468"
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{
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"summary": "https://github.com/python/cpython/issues/143935",
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"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/"
}
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"date": "2026-04-17T18:54:19+00:00",
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{
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}
],
"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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}
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}
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"title": "cpython: Missing character filtering in Python"
},
{
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"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2025-12-03T19:01:03.489250+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2418655"
}
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"title": "Vulnerability description"
},
{
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"text": "cpython: python: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products as it can lead to a denial of service. The flaw exists in the `xml.dom.minidom` module of cpython, where a quadratic algorithm in methods like `appendChild()` can be triggered when processing excessively nested XML documents. When successfully exploited this may impact the availability of applications utilizing this functionality across affected Red Hat products.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-12084"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/142145",
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],
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
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}
],
"threats": [
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"details": "Moderate"
}
],
"title": "cpython: python: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service"
},
{
"cve": "CVE-2025-13836",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2025-12-01T19:01:03.091899+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2418078"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the http.client module in the Python standard library. When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This issue allows a malicious server to cause the client to read large amounts of data into memory, potentially causing memory allocations errors, swapping, out-of-memory conditions or even system freezes.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cpython: Excessive read buffering DoS in http.client",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue can only be exploited by Python applications using the http.client.HTTPResponse.read function without the amount parameter, which specifies the read size in bytes. Note that Python libraries may use this function internally and make applications vulnerable. Additionally, vulnerable Python applications must connect to a malicious or compromised server that replies with a very large or crafted Content-Length header to trigger this issue, limiting the exposure of this vulnerability.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418078"
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},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13836"
},
{
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"category": "workaround",
"details": "Since this vulnerability is triggered when no read amount is specified and the client defaults to using the potentially malicious Content-Length header, developers can mitigate this issue in their code by always imposing an explicit, safe limit on data reads.\n\nApplications using the http.client.HTTPResponse.read function directly can ensure that read operations specify a byte limit:\n\n~~~\n...\nmax_safe_read = 10 * 1024 * 1024\ndata = response.read(max_safe_read)\n...\n~~~",
"product_ids": [
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}
],
"scores": [
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "cpython: Excessive read buffering DoS in http.client"
},
{
"cve": "CVE-2025-13837",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2025-12-01T19:01:32.492656+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2418084"
}
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"notes": [
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"title": "Vulnerability description"
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},
{
"category": "general",
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"title": "CVSS score applicability"
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"title": "cpython: Header injection via newlines in data URL mediatype in Python"
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"title": "cpython: wsgiref.headers.Headers allows header newline injection in Python"
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{
"cve": "CVE-2026-1299",
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},
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"text": "2432437"
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{
"category": "description",
"text": "A flaw was found in the email module in the Python standard library. When serializing an email message, the BytesGenerator class fails to properly quote newline characters for email headers. This issue is exploitable when the LiteralHeader class is used as it does not respect email folding rules, allowing an attacker to inject email headers and potentially modify message recipients or the email body, and spoof sender information.",
"title": "Vulnerability description"
},
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},
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"category": "other",
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"title": "Statement"
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{
"category": "general",
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"title": "CVSS score applicability"
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{
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"title": "cpython: CPython: Logging Bypass in Legacy .pyc File Handling"
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"id": "CWE-791",
"name": "Incomplete Filtering of Special Elements"
},
"discovery_date": "2026-03-16T18:02:25.997880+00:00",
"ids": [
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"system_name": "Red Hat Bugzilla ID",
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"text": "A control character validation flaw has been discovered in the Python http.cookie module. The Morsel.update(), |= operator, and unpickling paths were not patched to resolve CVE-2026-0672, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().",
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{
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"title": "Vulnerability summary"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"summary": "https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4",
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"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/"
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"title": "cpython: Incomplete control character validation in http.cookies"
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"id": "CWE-805",
"name": "Buffer Access with Incorrect Length Value"
},
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"text": "A stack overflow flaw has been discovered in the python pyexpat module. When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs. This will result in a program crash.",
"title": "Vulnerability description"
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{
"category": "summary",
"text": "cpython: Stack overflow parsing XML with deeply nested DTD content models",
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},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"summary": "https://github.com/python/cpython/issues/145986",
"url": "https://github.com/python/cpython/issues/145986"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/pull/145987",
"url": "https://github.com/python/cpython/pull/145987"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/"
}
],
"release_date": "2026-03-16T17:52:26.639000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-17T18:54:19+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "cpython: Stack overflow parsing XML with deeply nested DTD content models"
},
{
"cve": "CVE-2026-4786",
"cwe": {
"id": "CWE-88",
"name": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)"
},
"discovery_date": "2026-04-13T22:01:38.006388+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458049"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Python webbrowser.open() API. If a specially crafted URL containing \"%action\" is processed, an attacker could bypass a previous mitigation for CVE-2026-4519. This bypass allows for command injection into the underlying shell, potentially leading to arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw in the Python `webbrowser.open()` API allows for command injection and arbitrary code execution when processing specially crafted URLs containing \"%action\". This bypasses a previous mitigation for CVE-2026-4519.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-4786"
},
{
"category": "external",
"summary": "RHBZ#2458049",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458049"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-4786",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-4786"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4786",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4786"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/148169",
"url": "https://github.com/python/cpython/issues/148169"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/pull/148170",
"url": "https://github.com/python/cpython/pull/148170"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/"
}
],
"release_date": "2026-04-13T21:52:19.036000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-17T18:54:19+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API"
},
{
"cve": "CVE-2026-5713",
"cwe": {
"id": "CWE-822",
"name": "Untrusted Pointer Dereference"
},
"discovery_date": "2026-04-14T16:01:58.710183+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2458239"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Python. A malicious Python process could exploit the \"profiling.sampling\" module and \"asyncio introspection capabilities\" to read and write memory addresses within a privileged process. This vulnerability occurs when the privileged process connects to the malicious process via its remote debugging feature, potentially leading to information disclosure and arbitrary code execution. Successful exploitation requires repeated connections, which may cause instability in the connecting process.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process.",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-5713"
},
{
"category": "external",
"summary": "RHBZ#2458239",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458239"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-5713",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5713"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5713",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5713"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/148178",
"url": "https://github.com/python/cpython/issues/148178"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/pull/148187",
"url": "https://github.com/python/cpython/pull/148187"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/OG4RHARYSNIE22GGOMVMCRH76L5HKPLM/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/OG4RHARYSNIE22GGOMVMCRH76L5HKPLM/"
}
],
"release_date": "2026-04-14T15:11:51.122000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-17T18:54:19+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 6.0,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process."
},
{
"cve": "CVE-2026-6100",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-04-13T18:01:31.970255+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2457932"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Python\u0027s decompression modules, including `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile`. This vulnerability, a use-after-free, can occur if a program attempts to re-use a decompression object after a memory allocation error, especially when the system is experiencing high memory usage. Exploitation of this flaw could potentially allow an attacker to execute arbitrary code or access sensitive data. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The severity of this flaw is somewhat mitigated on Red Hat platforms. By default processes are not executed with root user privilege and are limited in their scope which in turn limits the impact of this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
},
"references": [
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-6100"
},
{
"category": "external",
"summary": "RHBZ#2457932",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457932"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-6100"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6100",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6100"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/commit/6a5f79c8d7bbf22b083b240910c7a8781a59437d",
"url": "https://github.com/python/cpython/commit/6a5f79c8d7bbf22b083b240910c7a8781a59437d"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/commit/8fc66aef6d7b3ae58f43f5c66f9366cc8cbbfcd2",
"url": "https://github.com/python/cpython/commit/8fc66aef6d7b3ae58f43f5c66f9366cc8cbbfcd2"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/commit/c3cf71c3366fe49acb776a639405c0eea6169c20",
"url": "https://github.com/python/cpython/commit/c3cf71c3366fe49acb776a639405c0eea6169c20"
},
{
"category": "external",
"summary": "https://github.com/python/cpython/issues/148395",
"url": "https://github.com/python/cpython/issues/148395"
},
{
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"summary": "https://github.com/python/cpython/pull/148396",
"url": "https://github.com/python/cpython/pull/148396"
},
{
"category": "external",
"summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/",
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/"
}
],
"release_date": "2026-04-13T17:15:47.606000+00:00",
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{
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"date": "2026-04-17T18:54:19+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
"product_ids": [
"Red Hat Hardened Images:python3-11-main@aarch64",
"Red Hat Hardened Images:python3-11-main@src",
"Red Hat Hardened Images:python3-11-main@x86_64"
]
}
],
"scores": [
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"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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