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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 : upgrade Red Hat fence-agents to 8.6.1 soon.

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.
Patch
Available – fixed in 8.6.1

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

Upgrade Red Hat fence-agents to 8.6.1.

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • >=8.6 <8.6.1
Fixed in
  • 8.6.1

AI-suggested

Red Hat has released updated fence-agents packages that fix this vulnerability. Users of affected Red Hat Enterprise Linux 8.6 versions should apply the security update as described in the Red Hat advisory RHSA-2026:58835. Detailed instructions for applying the update are available at https://access.redhat.com/articles/11258. Since a fix is available, applying the official patch is the recommended mitigation.

Description

A security update for the fence-agents package in Red Hat Enterprise Linux addresses a denial of service vulnerability in the pyasn1 library. The vulnerability (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. Red Hat has rated this update as important and has released patches for affected versions of Red Hat Enterprise Linux 8.6.

References

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