pyasn1 has quadratic-time denial of service in constructed string and indefinite-length ANY decoding

Date Oct 30, 2026
Type Vendor advisory
Signal High-risk advisory
Vendor / Product PyPI ยท pyasn1
CVE CVE-2026-119195
High-risk advisory CVE-2026-119195

Summary

pyasn1 has quadratic-time denial of service in constructed string and indefinite-length ANY decoding

Why it matters

GitHub has published a reviewed security advisory for pyasn1. Prioritize it with other application dependency updates, especially because EPSS places it in the 45% percentile.

Operator check

Check whether pyasn1 is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.5%; percentile: 45%.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.