Improper Certificate Validation Affecting uv package, versions [,0.13.4)
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Test your applications- Snyk IDSNYK-PYTHON-UV-21460703
- published23 Oct 2026
- disclosed20 Oct 2026
- creditWilliam Woodruff
Introduced: 20 Oct 2026
New CVE NOT AVAILABLE CWE-295 (opens in a new tab)How to fix?
Upgrade uv to version 0.13.4 or higher.
Overview
uv is an An extremely fast Python package and project manager, written in Rust.
Affected versions of this package are vulnerable to Improper Certificate Validation via uv's bundled CA store trusts an emSign root whose intermediate CA keys are compromised. By default, uv verifies TLS connections against a vendored copy of the webpki-root-certs bundle. Versions before 0.13.4 include the emSign ECC Root CA - G3 root. Eight eMudhra intermediate CA certificates that chain to that root have compromised private keys, and the CA has revoked them. An attacker with one of the compromised keys can issue certificates that uv accepts for any hostname, and can be used to issue certificates to enable MITM attacks.