Red Hat Security Advisory: fence-agents security update
The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster. Security Fix(es): * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471) * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) (CVE-2026-21441) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The fence-agents package in Red Hat Enterprise Linux 8.8 includes scripts for remote power management of cluster devices, enabling forced restart and removal of failed or unreachable nodes. Two security flaws in the urllib3 streaming API used by these agents have been identified: CVE-2025-66471 involves improper handling of highly compressed data, and CVE-2026-21441 allows bypassing the decompression-bomb safeguard when following HTTP redirects. These vulnerabilities could potentially be exploited to disrupt cluster node management. Red Hat has released updated fence-agents packages to fix these issues in version 8.8.
Potential Impact
The vulnerabilities affect the urllib3 streaming API used by fence-agents, which manage remote power control in cluster environments. Improper handling of compressed data and bypassing decompression safeguards could lead to denial of service or other disruptions in cluster node management. The advisory classifies the impact as Important, indicating a high severity but no confirmed active exploitation in the wild at this time.
Mitigation Recommendations
Red Hat has released updated fence-agents packages for Red Hat Enterprise Linux 8.8 that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2026:1791 to remediate the issues. No additional mitigation steps are indicated beyond applying the official patch.
Red Hat Security Advisory: fence-agents security update
Description
The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster. Security Fix(es): * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471) * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) (CVE-2026-21441) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The fence-agents package in Red Hat Enterprise Linux 8.8 includes scripts for remote power management of cluster devices, enabling forced restart and removal of failed or unreachable nodes. Two security flaws in the urllib3 streaming API used by these agents have been identified: CVE-2025-66471 involves improper handling of highly compressed data, and CVE-2026-21441 allows bypassing the decompression-bomb safeguard when following HTTP redirects. These vulnerabilities could potentially be exploited to disrupt cluster node management. Red Hat has released updated fence-agents packages to fix these issues in version 8.8.
Potential Impact
The vulnerabilities affect the urllib3 streaming API used by fence-agents, which manage remote power control in cluster environments. Improper handling of compressed data and bypassing decompression safeguards could lead to denial of service or other disruptions in cluster node management. The advisory classifies the impact as Important, indicating a high severity but no confirmed active exploitation in the wild at this time.
Mitigation Recommendations
Red Hat has released updated fence-agents packages for Red Hat Enterprise Linux 8.8 that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2026:1791 to remediate the issues. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:1791
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-21441"]
Threat ID: 6a160972e29bf47b5063b71c
Added to database: 05/26/2026, 20:58:26 UTC
Last enriched: 08/10/2026, 17:47:34 UTC
Last updated: 09/10/2026, 19:36:51 UTC
Views: 119
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