RHSA-2026:53363HighCVSS 7.5

Red Hat Security Advisory: fence-agents security update

Published
August 11, 2026
Last Modified
August 11, 2026

🔗 CVE IDs covered (1)

CVE-2026-59886 →

📋 Description

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

🎯 Affected products109

  • Red Hat Enterprise Linux AppStream (v. 8)
  • Red Hat Enterprise Linux HighAvailability (v. 8)
  • Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-0:4.2.1-129.el8_10.29.src as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-aliyun-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux HighAvailability (v. 8)
  • fence-agents-aliyun-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-aliyun-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-aliyun-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux HighAvailability (v. 8)
  • fence-agents-aliyun-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-all-0:4.2.1-129.el8_10.29.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-all-0:4.2.1-129.el8_10.29.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-all-0:4.2.1-129.el8_10.29.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-all-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-amt-ws-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-apc-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-apc-snmp-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-aws-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux HighAvailability (v. 8)
  • fence-agents-aws-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-azure-arm-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux HighAvailability (v. 8)
  • fence-agents-azure-arm-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-azure-arm-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-azure-arm-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux HighAvailability (v. 8)
  • fence-agents-azure-arm-debuginfo-0:4.2.1-129.el8_10.29.x86_64 as a component of Red Hat Enterprise Linux ResilientStorage (v. 8)
  • fence-agents-bladecenter-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-brocade-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-cisco-mds-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-cisco-ucs-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-common-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-compute-0:4.2.1-129.el8_10.29.noarch as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • fence-agents-debuginfo-0:4.2.1-129.el8_10.29.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +79 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)