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Advisory record · GHSA-8ppf-4f7h-5ppj

pyasn1: Quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID processing allows denial of service

CVSS 7.5 HighEPSS 0.0062 · 50th percentile

Published by the GitHub Advisory Database at 21 Jul 2026, 19:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pyasn1PyPI<0.6.40.6.4
Identifiers
GHSA-8ppf-4f7h-5ppj · CVE-2026-59885 · PYSEC-2026-3456
Weakness (CWE)
CWE-400 · CWE-407
Tags
Published
21 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

pyasn1 versions before 0.6.4 are vulnerable to denial of service through OBJECT IDENTIFIER and RELATIVE-OID values. The BER, CER and DER decoders, and the corresponding encoders, process these values in quadratic time as the number of arcs grows. An attacker who can supply ASN.1 data to an application that decodes it (such as certificates, LDAP, SNMP or Kerberos) can send a small crafted payload to consume seconds of CPU per decode call. Upgrade to pyasn1 0.6.4 or later; as a workaround, limit the size of untrusted ASN.1 input before decoding.

Written 1 Nov 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 0.0062, the 50th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 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.