Package vulnerability, severity high

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

Published October 30, 2026, updated October 31, 2026

pyasn1 has quadratic-time denial of service in constructed string and indefinite-length ANY decoding. Source: GHSA-9m75-vc3g-4x39 (CVE-2026-119195).

What's affected

• pyasn1 (pypi)<0.6.5

What to do

1. Upgrade pyasn1 to 0.6.5 or later.

Check whether you were affected

Pharon tells teams automatically when this affects something they run. To check a machine, run this in Claude Code with the Pharon plugin, in the repository that uses it:

/pharon:check-incident ghsa-9m75-vc3g-4x39

References

• https://osv.dev/vulnerability/GHSA-9m75-vc3g-4x39
• https://github.com/pyasn1/pyasn1/security/advisories/GHSA-9m75-vc3g-4x39
• https://nvd.nist.gov/vuln/detail/CVE-2026-119195
• https://github.com/pyasn1/pyasn1/pull/132
• https://github.com/pyasn1/pyasn1/commit/4ce00797c594b59c1fd6b86d9ebc3ba87b7ec9f9
• https://github.com/pyasn1/pyasn1
• https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5

Notice ghsa-9m75-vc3g-4x39, signed with key feed-prod-2026-10 (Ed25519). The Pharon CLI verifies the signature before using a notice.