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 packages in Red Hat Enterprise Linux 8.4 include scripts for remote power management of cluster nodes, allowing forced restarts and removal of failed or unreachable nodes. Two security vulnerabilities in the urllib3 Streaming API used by these packages have been identified: CVE-2025-66471, which involves improper handling of highly compressed data, and CVE-2026-21441, which allows bypassing decompression-bomb safeguards when following HTTP redirects. Red Hat has released updated fence-agents packages to address these issues in affected versions of Red Hat Enterprise Linux 8.4 with Advanced Update Support and Extended Update Support.
Potential Impact
The vulnerabilities affect the urllib3 Streaming API used by fence-agents, potentially allowing improper handling of compressed data and bypassing decompression safeguards. This could lead to resource exhaustion or denial of service conditions during remote power management operations in cluster environments. The advisory rates the impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated fence-agents packages to fix these vulnerabilities. Users of Red Hat Enterprise Linux 8.4 Advanced Update Support and Extended Update Support should apply the security update as described in the Red Hat advisory RHSA-2026:1803. Refer to https://access.redhat.com/articles/11258 for detailed instructions on applying the update. No additional mitigation steps are indicated by the vendor.
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 packages in Red Hat Enterprise Linux 8.4 include scripts for remote power management of cluster nodes, allowing forced restarts and removal of failed or unreachable nodes. Two security vulnerabilities in the urllib3 Streaming API used by these packages have been identified: CVE-2025-66471, which involves improper handling of highly compressed data, and CVE-2026-21441, which allows bypassing decompression-bomb safeguards when following HTTP redirects. Red Hat has released updated fence-agents packages to address these issues in affected versions of Red Hat Enterprise Linux 8.4 with Advanced Update Support and Extended Update Support.
Potential Impact
The vulnerabilities affect the urllib3 Streaming API used by fence-agents, potentially allowing improper handling of compressed data and bypassing decompression safeguards. This could lead to resource exhaustion or denial of service conditions during remote power management operations in cluster environments. The advisory rates the impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated fence-agents packages to fix these vulnerabilities. Users of Red Hat Enterprise Linux 8.4 Advanced Update Support and Extended Update Support should apply the security update as described in the Red Hat advisory RHSA-2026:1803. Refer to https://access.redhat.com/articles/11258 for detailed instructions on applying the update. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:1803
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-21441"]
- Cvss Version
- null
Threat ID: 6a16096be29bf47b5063197e
Added to database: 05/26/2026, 20:58:19 UTC
Last enriched: 08/17/2026, 17:46:18 UTC
Last updated: 08/25/2026, 13:37:57 UTC
Views: 37
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