Red Hat Security Advisory: fence-agents security update
This security advisory from Red Hat addresses vulnerabilities in the fence-agents packages, which are used for remote power management in cluster environments. The update fixes two issues in the urllib3 library: improper handling of highly compressed data (CVE-2025-66471) and a decompression-bomb safeguard bypass when following HTTP redirects (CVE-2026-21441). These vulnerabilities could potentially affect the stability or security of cluster node management. Red Hat has rated the update as Important and provides updated packages for Red Hat Enterprise Linux 9. 6 Extended Update Support and related variants. No CVSS scores are provided in the advisory. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
The fence-agents packages in Red Hat Enterprise Linux provide scripts for remote power management of cluster nodes, enabling forced restart and removal of failed or unreachable nodes. Two security issues in the urllib3 Streaming API used by these packages have been addressed: CVE-2025-66471 involves improper handling of highly compressed data, and CVE-2026-21441 involves a bypass of decompression-bomb safeguards when following HTTP redirects. These vulnerabilities could lead to resource exhaustion or denial of service conditions during data streaming. Red Hat has released updated fence-agents packages for multiple architectures and variants of RHEL 9.6 Extended Update Support to remediate these issues.
Potential Impact
The vulnerabilities affect the urllib3 Streaming API used by fence-agents, potentially allowing improper handling of compressed data and bypassing decompression-bomb safeguards. This could result in resource exhaustion or denial of service in cluster management operations. The advisory does not report any known exploitation in the wild. The impact is rated as Important by Red Hat, indicating a significant but not critical security risk.
Mitigation Recommendations
Red Hat has released updated fence-agents packages that address these vulnerabilities. Users of affected Red Hat Enterprise Linux 9.6 Extended Update Support versions should apply the provided updates as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the official patches.
Red Hat Security Advisory: fence-agents security update
Description
This security advisory from Red Hat addresses vulnerabilities in the fence-agents packages, which are used for remote power management in cluster environments. The update fixes two issues in the urllib3 library: improper handling of highly compressed data (CVE-2025-66471) and a decompression-bomb safeguard bypass when following HTTP redirects (CVE-2026-21441). These vulnerabilities could potentially affect the stability or security of cluster node management. Red Hat has rated the update as Important and provides updated packages for Red Hat Enterprise Linux 9. 6 Extended Update Support and related variants. No CVSS scores are provided in the advisory. There are no known exploits in the wild at this time.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The fence-agents packages in Red Hat Enterprise Linux provide scripts for remote power management of cluster nodes, enabling forced restart and removal of failed or unreachable nodes. Two security issues in the urllib3 Streaming API used by these packages have been addressed: CVE-2025-66471 involves improper handling of highly compressed data, and CVE-2026-21441 involves a bypass of decompression-bomb safeguards when following HTTP redirects. These vulnerabilities could lead to resource exhaustion or denial of service conditions during data streaming. Red Hat has released updated fence-agents packages for multiple architectures and variants of RHEL 9.6 Extended Update Support to remediate these issues.
Potential Impact
The vulnerabilities affect the urllib3 Streaming API used by fence-agents, potentially allowing improper handling of compressed data and bypassing decompression-bomb safeguards. This could result in resource exhaustion or denial of service in cluster management operations. The advisory does not report any known exploitation in the wild. The impact is rated as Important by Red Hat, indicating a significant but not critical security risk.
Mitigation Recommendations
Red Hat has released updated fence-agents packages that address these vulnerabilities. Users of affected Red Hat Enterprise Linux 9.6 Extended Update Support versions should apply the provided updates as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:1706
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-21441"]
- Cvss Version
- null
Threat ID: 6a16096ce29bf47b50632ab1
Added to database: 5/26/2026, 8:58:20 PM
Last enriched: 5/27/2026, 1:20:14 AM
Last updated: 5/27/2026, 4:59:16 AM
Views: 2
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