Red Hat Security Advisory: python3.11-urllib3 security update
Multiple security vulnerabilities have been identified in the python3. 11-urllib3 package used in Red Hat Enterprise Linux 9. 6 Extended Update Support. These include an unbounded decompression chain leading to resource exhaustion, improper handling of highly compressed data in the streaming API, and a decompression-bomb safeguard bypass when following HTTP redirects. Red Hat has issued an important security advisory with updated packages addressing these issues. The vulnerabilities are rated with high severity and affect several architectures and variants of Red Hat Enterprise Linux 9. 6. Users are advised to apply the available security update to mitigate these risks.
AI Analysis
Technical Summary
The python3.11-urllib3 package in Red Hat Enterprise Linux 9.6 contains three notable vulnerabilities: CVE-2025-66418 involves an unbounded decompression chain that can cause resource exhaustion; CVE-2025-66471 concerns improper handling of highly compressed data in the urllib3 streaming API; and CVE-2026-21441 allows bypassing the decompression-bomb safeguard when following HTTP redirects in the streaming API. These issues could lead to denial of service or resource exhaustion conditions. Red Hat has released updated python3.11-urllib3 packages to address these vulnerabilities across multiple supported architectures and product variants.
Potential Impact
The vulnerabilities can lead to resource exhaustion or denial of service conditions due to unbounded decompression or improper handling of compressed data in the urllib3 library used by Python 3.11. This affects systems running Red Hat Enterprise Linux 9.6 Extended Update Support and related variants. There are no known exploits in the wild at this time. The impact is rated as high severity by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated python3.11-urllib3 packages that fix these vulnerabilities. Users running affected versions of Red Hat Enterprise Linux 9.6 Extended Update Support should apply the security update as detailed in the Red Hat advisory RHSA-2026:1704 and the referenced article https://access.redhat.com/articles/11258. Applying this update will mitigate the identified issues. Patch status is confirmed as available from the vendor advisory.
Red Hat Security Advisory: python3.11-urllib3 security update
Description
Multiple security vulnerabilities have been identified in the python3. 11-urllib3 package used in Red Hat Enterprise Linux 9. 6 Extended Update Support. These include an unbounded decompression chain leading to resource exhaustion, improper handling of highly compressed data in the streaming API, and a decompression-bomb safeguard bypass when following HTTP redirects. Red Hat has issued an important security advisory with updated packages addressing these issues. The vulnerabilities are rated with high severity and affect several architectures and variants of Red Hat Enterprise Linux 9. 6. Users are advised to apply the available security update to mitigate these risks.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The python3.11-urllib3 package in Red Hat Enterprise Linux 9.6 contains three notable vulnerabilities: CVE-2025-66418 involves an unbounded decompression chain that can cause resource exhaustion; CVE-2025-66471 concerns improper handling of highly compressed data in the urllib3 streaming API; and CVE-2026-21441 allows bypassing the decompression-bomb safeguard when following HTTP redirects in the streaming API. These issues could lead to denial of service or resource exhaustion conditions. Red Hat has released updated python3.11-urllib3 packages to address these vulnerabilities across multiple supported architectures and product variants.
Potential Impact
The vulnerabilities can lead to resource exhaustion or denial of service conditions due to unbounded decompression or improper handling of compressed data in the urllib3 library used by Python 3.11. This affects systems running Red Hat Enterprise Linux 9.6 Extended Update Support and related variants. There are no known exploits in the wild at this time. The impact is rated as high severity by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated python3.11-urllib3 packages that fix these vulnerabilities. Users running affected versions of Red Hat Enterprise Linux 9.6 Extended Update Support should apply the security update as detailed in the Red Hat advisory RHSA-2026:1704 and the referenced article https://access.redhat.com/articles/11258. Applying this update will mitigate the identified issues. Patch status is confirmed as available from the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:1704
- Cve Count
- 3
- Additional Cves
- ["CVE-2025-66471","CVE-2026-21441"]
- Cvss Version
- null
Threat ID: 6a16096ce29bf47b50632ab8
Added to database: 5/26/2026, 8:58:20 PM
Last enriched: 5/27/2026, 1:20:06 AM
Last updated: 5/27/2026, 4:54:41 AM
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.