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Advisory record · GHSA-9m75-vc3g-4x39

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

CVSS 7.5 HighEPSS 0.0053 · 44th percentile

Published by the GitHub Advisory Database at 30 Oct 2026, 23:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pyasn1PyPI<0.6.50.6.5
Identifiers
GHSA-9m75-vc3g-4x39 · CVE-2026-119195
Weakness (CWE)
CWE-407
Tags
Published
30 Oct 2026
Updated
30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

pyasn1 versions before 0.6.5 take roughly quadratic time to decode constructed OCTET STRING and character string values, and indefinite-length ANY values, that are split into many fragments. An attacker who can supply crafted ASN.1 input to an application that decodes it can exhaust CPU and cause a denial of service. Upgrade to pyasn1 0.6.5, the fixed version; until then, limit the size of untrusted input before it is decoded.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.