RHSA-2026:53459
Vulnerability from csaf_redhat - Published: 2026-08-11 12:33 - Updated: 2026-09-25 03:29Summary
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:
python-urllib3:
* python3-urllib3+brotli-2.7.0-7.hum1 (noarch)
* python3-urllib3+h2-2.7.0-7.hum1 (noarch)
* python3-urllib3+socks-2.7.0-7.hum1 (noarch)
* python3-urllib3+zstd-2.7.0-7.hum1 (noarch)
* python3-urllib3-2.7.0-7.hum1 (noarch)
* python-urllib3-2.7.0-7.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.
urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (`preload_content=False`) when using Brotli support. The issue arises due to three independent code paths in `response.py` that bypass the `max_length` protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative `max_length` values can be produced due to buffer arithmetic in `read()`, `flush_decoder` unconditionally overrides `max_length` to `-1`, and `_flush_decoder()` passes no limit at all, defaulting to unlimited decompression. This allows a malicious HTTP server to trigger an out-of-memory (OOM) condition by decompressing large payloads into memory, leading to a denial of service (DoS). The vulnerability affects urllib3 2.6.3 and Brotli 1.2.0 and impacts applications and libraries using `requests` or `urllib3` to stream content from untrusted sources.
7.5 (High)
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:python-urllib3-0:2.7.0-7.hum1@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
11 references
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},
"discovery_date": "2026-06-19T20:00:55.611634+00:00",
"ids": [
{
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"text": "2490897"
}
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{
"category": "description",
"text": "urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (`preload_content=False`) when using Brotli support. The issue arises due to three independent code paths in `response.py` that bypass the `max_length` protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative `max_length` values can be produced due to buffer arithmetic in `read()`, `flush_decoder` unconditionally overrides `max_length` to `-1`, and `_flush_decoder()` passes no limit at all, defaulting to unlimited decompression. This allows a malicious HTTP server to trigger an out-of-memory (OOM) condition by decompressing large payloads into memory, leading to a denial of service (DoS). The vulnerability affects urllib3 2.6.3 and Brotli 1.2.0 and impacts applications and libraries using `requests` or `urllib3` to stream content from untrusted sources.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "urllib3: urllib3: Denial of Service via decompression bomb bypass with Brotli support",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Rejected: \n\n* CVE-2026-9375 was withdrawn by its CNA (huntr) on 2026-08-13 as a duplicate of CVE-2026-44432.",
"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:python-urllib3-0:2.7.0-7.hum1@src",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-9375"
},
{
"category": "external",
"summary": "RHBZ#2490897",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2490897"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9375",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9375"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9375",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9375"
},
{
"category": "external",
"summary": "https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a",
"url": "https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a"
},
{
"category": "external",
"summary": "https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23",
"url": "https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23"
}
],
"release_date": "2026-06-19T18:45:10.409000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-11T12:33:27+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:python-urllib3-0:2.7.0-7.hum1@src",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:53459"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"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"
},
"products": [
"Red Hat Hardened Images:python-urllib3-0:2.7.0-7.hum1@src",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+brotli-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+h2-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+socks-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3+zstd-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:python3-urllib3-0:2.7.0-7.hum1@noarch@public-hummingbird-x86_64-rpms"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "urllib3: urllib3: Denial of Service via decompression bomb bypass with Brotli support"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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