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Advisory record · GHSA-hq85-5cpj-mr62

uv's bundled CA store trusts an emSign root whose intermediate CA keys are compromised

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 20 Oct 2026, 19:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
uvPyPI<0.13.40.13.4
Identifiers
GHSA-hq85-5cpj-mr62 · PYSEC-2026-4321
Weakness (CWE)
CWE-295
Tags
Published
20 Oct 2026
Updated
20 Oct 2026

Machine-written summary

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

uv versions before 0.13.4 verify TLS connections against a bundled copy of trusted root certificates, and that bundle includes the emSign ECC Root CA - G3 root. Eight eMudhra intermediate CA certificates chaining to that root have compromised private keys and have been revoked. An attacker holding one of those keys could issue certificates that uv accepts for any hostname and use them for man-in-the-middle attacks. Upgrade uv to 0.13.4 or later, which removes the root from the bundle.

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
Not published None 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 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.