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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.

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.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 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

AI-suggested

Red Hat has released updated fence-agents packages that address this vulnerability. Users should apply the security update as described in the Red Hat advisory RHSA-2026:1906 to remediate the issue. No additional mitigation steps are indicated beyond applying the official patch.

Description

A denial of service vulnerability exists in the pyasn1 component used by the fence-agents packages in Red Hat Enterprise Linux 8. The issue is caused by memory exhaustion triggered by a malformed RELATIVE-OID. Fence-agents provide scripts for remote power management in cluster environments, allowing failed or unreachable nodes to be forcibly restarted and removed from the cluster. This vulnerability could disrupt cluster operations by causing denial of service conditions.

References

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