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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 24 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 updated fence-agents packages that fix this vulnerability. Users of affected Red Hat Enterprise Linux 9.6 Extended Update Support and related variants should apply the provided security update as described in the Red Hat advisory (RHSA-2026:58548). No additional mitigation steps are indicated beyond applying the official patch.

Description

A security update for the fence-agents packages in Red Hat Enterprise Linux addresses a denial of service vulnerability in the pyasn1 library. The flaw (CVE-2026-59886) involves crafted ASN.1 REAL values that can cause a denial of service. Fence-agents are used for remote power management in cluster environments to forcibly restart and remove failed or unreachable nodes. This update is rated as important by Red Hat Product Security and applies to Red Hat Enterprise Linux 9.6 Extended Update Support and related variants.

References

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