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CVE-2026-23490VulnerabilityPublished Updated

Red Hat Security Advisory: fence-agents security update

Affects Red Hat fence-agentsSource GCVE Database

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Not known to be exploited : upgrade Red Hat fence-agents to 8.6.21 soon.

Data as of 31 Oct 2026, 20:20 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 8.6.21

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Feb 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade Red Hat fence-agents to 8.6.21.

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • >=8.6 <8.6.21
Fixed in
  • 8.6.21

AI-suggested

Red Hat has released updated fence-agents packages that fix this vulnerability. Users should apply the security update as described in Red Hat advisory RHSA-2026:2486 to remediate the issue. No additional mitigation is indicated by the vendor advisory.

Description

A denial of service vulnerability (CVE-2026-23490) exists in the pyasn1 component used by fence-agents, which handle remote power management for cluster devices in Red Hat Enterprise Linux 8.6. The flaw is due to memory exhaustion caused by malformed RELATIVE-OID data. This can cause affected systems to become unresponsive or crash during processing of malicious input. Red Hat has released an update to fence-agents packages to address this issue.

References

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