RHSA-2026:58821HighCVSS 7.5

Red Hat Security Advisory: fence-agents security update

Published
August 24, 2026
Last Modified
August 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-59886 →

📋 Description

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

🎯 Affected products114

  • Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • Red Hat Enterprise Linux High Availability AUS (v.8.4)
  • Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4)
  • fence-agents-0:4.2.1-65.el8_4.32.src as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-0:4.2.1-65.el8_4.32.src as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-aliyun-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux High Availability AUS (v.8.4)
  • fence-agents-aliyun-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4)
  • fence-agents-aliyun-debuginfo-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-aliyun-debuginfo-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-aliyun-debuginfo-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux High Availability AUS (v.8.4)
  • fence-agents-aliyun-debuginfo-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4)
  • fence-agents-all-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-all-0:4.2.1-65.el8_4.32.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-amt-ws-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-amt-ws-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-apc-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-apc-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-apc-snmp-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-apc-snmp-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-aws-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux High Availability AUS (v.8.4)
  • fence-agents-aws-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4)
  • fence-agents-azure-arm-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux High Availability AUS (v.8.4)
  • fence-agents-azure-arm-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4)
  • fence-agents-bladecenter-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-bladecenter-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-brocade-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-brocade-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • fence-agents-cisco-mds-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • fence-agents-cisco-mds-0:4.2.1-65.el8_4.32.noarch as a component of Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • +84 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)