RHSA-2026:7477
Vulnerability from csaf_redhat - Published: 2026-04-10 20:19 - Updated: 2026-04-22 18:11Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
gnutls:
* gnutls-3.8.12-1.1.hum1 (aarch64, x86_64)
* gnutls-c++-3.8.12-1.1.hum1 (aarch64, x86_64)
* gnutls-dane-3.8.12-1.1.hum1 (aarch64, x86_64)
* gnutls-devel-3.8.12-1.1.hum1 (aarch64, x86_64)
* gnutls-fips-3.8.12-1.1.hum1 (aarch64, x86_64)
* gnutls-utils-3.8.12-1.1.hum1 (aarch64, x86_64)
* mingw32-gnutls-3.8.12-1.1.hum1 (noarch)
* mingw64-gnutls-3.8.12-1.1.hum1 (noarch)
* gnutls-3.8.12-1.1.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 flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.
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-2026:7477
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Applying the upstream patch or vendor-supplied security update is the recommended resolution.
A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU (Central Processing Unit) and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names (SANs).
5.3 (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-2026:7477
A flaw was found in GnuTLS. A double-free vulnerability exists in GnuTLS due to incorrect ownership handling in the export logic of Subject Alternative Name (SAN) entries containing an otherName. If the type-id OID is invalid or malformed, GnuTLS will call asn1_delete_structure() on an ASN.1 node it does not own, leading to a double-free condition when the parent function or caller later attempts to free the same structure. This vulnerability can be triggered using only public GnuTLS APIs and may result in denial of service or memory corruption, depending on allocator behavior.
6.5 (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-2026:7477
Workaround
Currently, no mitigation is available for this vulnerability.
A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.
5.3 (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-2026:7477
Workaround
Currently, no mitigation is available for this vulnerability.
A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system.
6.5 (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-2026:7477
Workaround
Currently, no mitigation is available for this vulnerability.
References
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{
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{
"category": "other",
"text": "This vulnerability is rated Moderate rather than Important because, although it involves a memory management flaw (double-free) that can potentially lead to memory corruption, practical exploitation is limited by modern memory protection mechanisms and contextual constraints. The issue occurs only when processing malformed SAN otherName entries through public GnuTLS APIs\u2014an uncommon and controlled code path in most deployments. Furthermore, exploitation for arbitrary code execution is highly dependent on allocator behavior and requires precise heap manipulation, which is non-trivial under defenses such as Address Space Layout Randomization (ASLR), Data Execution Prevention (DEP), and hardened memory allocators. In the majority of cases, the outcome would be a crash or denial of service rather than a reliable compromise of integrity or confidentiality. Therefore, given its limited attack surface, dependency on crafted input, and the presence of strong runtime mitigations, the impact justifies a Moderate severity classification instead of Important.\n\nAs such, successfully triggering this vulnerability would require a sophisticated attack vector that is capable of accounting for the many native and deployed security mechanisms designed to detect and contain a double-free condition.",
"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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-32988"
},
{
"category": "external",
"summary": "RHBZ#2359622",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2359622"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-32988",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-32988"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-32988",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-32988"
},
{
"category": "external",
"summary": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html",
"url": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html"
}
],
"release_date": "2025-07-10T07:55:14.310000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-10T20:19:55+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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:7477"
},
{
"category": "workaround",
"details": "Currently, no mitigation is available for this vulnerability.",
"product_ids": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: Vulnerability in GnuTLS otherName SAN export"
},
{
"cve": "CVE-2025-32989",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2025-04-15T01:21:36.512000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2359621"
}
],
"notes": [
{
"category": "description",
"text": "A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: Vulnerability in GnuTLS SCT extension parsing",
"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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-32989"
},
{
"category": "external",
"summary": "RHBZ#2359621",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2359621"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-32989",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-32989"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-32989",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-32989"
},
{
"category": "external",
"summary": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html",
"url": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html"
}
],
"release_date": "2025-07-10T07:54:13.541000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-10T20:19:55+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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:7477"
},
{
"category": "workaround",
"details": "Currently, no mitigation is available for this vulnerability.",
"product_ids": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: Vulnerability in GnuTLS SCT extension parsing"
},
{
"cve": "CVE-2025-32990",
"cwe": {
"id": "CWE-122",
"name": "Heap-based Buffer Overflow"
},
"discovery_date": "2025-04-15T01:21:36.656000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2359620"
}
],
"notes": [
{
"category": "description",
"text": "A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: Vulnerability in GnuTLS certtool template parsing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as a moderate severity because a heap-buffer-overflow (off-by-one) flaw was found exclusively in the certtool utility\u0027s template parsing logic (part of the gnutls-utils package), and does not affect the core gnutls library itself. This issue is triggered when the tool processes specially crafted settings from a template file, leading to an out-of-bounds NULL pointer write. The resulting memory corruption causes a denial-of-service by crashing the application.",
"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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-32990"
},
{
"category": "external",
"summary": "RHBZ#2359620",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2359620"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-32990",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-32990"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-32990",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-32990"
},
{
"category": "external",
"summary": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html",
"url": "https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html"
}
],
"release_date": "2025-07-09T07:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-10T20:19:55+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:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:7477"
},
{
"category": "workaround",
"details": "Currently, no mitigation is available for this vulnerability.",
"product_ids": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:gnutls-main@aarch64",
"Red Hat Hardened Images:gnutls-main@noarch",
"Red Hat Hardened Images:gnutls-main@src",
"Red Hat Hardened Images:gnutls-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: Vulnerability in GnuTLS certtool template parsing"
}
]
}
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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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