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CVE-2026-59886VulnerabilityPublished 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 30 Oct 2026, 11:52 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Aug 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 30 Oct 2026.

What to do

AI-suggested

Red Hat has released an updated fence-agents package for Red Hat Enterprise Linux 9 and its Extended Update Support versions that addresses this vulnerability. Users should apply the security update as described in the Red Hat advisory (RHSA-2026:53365) to remediate the issue. No additional mitigation steps are indicated beyond applying the official patch.

Description

A denial of service vulnerability (CVE-2026-59886) exists in the pyasn1 library used by the fence-agents packages in Red Hat Enterprise Linux 9. The flaw involves crafted ASN.1 REAL values that can cause service disruption. Fence-agents manage remote power control for cluster nodes, allowing failed nodes to be forcibly restarted or removed. This update addresses the vulnerability to prevent denial of service conditions.

References

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