RHSA-2026:58548HighCVSS 7.5

Red Hat Security Advisory: fence-agents security update

Published
August 24, 2026
Last Modified
August 24, 2026

🔗 CVE IDs covered (1)

CVE-2026-59886 →

📋 Description

CVE-2026-59886 — pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values

🎯 Affected products97

  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-0:4.10.0-86.el9_6.21.src as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-aliyun-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-all-0:4.10.0-86.el9_6.21.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-all-0:4.10.0-86.el9_6.21.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-all-0:4.10.0-86.el9_6.21.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-all-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-amt-ws-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-apc-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-apc-snmp-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-aws-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-azure-arm-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-bladecenter-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-brocade-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-cisco-mds-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-cisco-ucs-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-common-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-compute-0:4.10.0-86.el9_6.21.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-compute-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debuginfo-0:4.10.0-86.el9_6.21.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debuginfo-0:4.10.0-86.el9_6.21.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debuginfo-0:4.10.0-86.el9_6.21.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debuginfo-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debugsource-0:4.10.0-86.el9_6.21.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debugsource-0:4.10.0-86.el9_6.21.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debugsource-0:4.10.0-86.el9_6.21.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-debugsource-0:4.10.0-86.el9_6.21.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-drac5-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-eaton-snmp-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • fence-agents-emerson-0:4.10.0-86.el9_6.21.noarch as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • +67 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: When processing untrusted ASN.1 data with pyasn1, avoid calling prettyPrint(), str(), float(), int(), or performing comparisons or arithmetic on decoded Real (ASN.1 REAL type) objects. Instead, inspect the raw (mantissa, base, exponent) tuple directly. Where logging decoded ASN.1 structures is necessary, filter out or sanitize Real-typed values before conversion.

🔗 References (4)