RHSA-2026:59239HighCVSS 7.5

Red Hat Security Advisory: python-pyasn1 security update

Published
August 25, 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 products4

  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • python-pyasn1-0:0.4.8-6.el9_2.2.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • python3-pyasn1-0:0.4.8-6.el9_2.2.noarch as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • python3-pyasn1-modules-0:0.4.8-6.el9_2.2.noarch as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)

✅ 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)