GHSA-hq85-5cpj-mr62
uv's bundled CA store trusts an emSign root whose intermediate CA keys are compromised
- Risk score
- 65/100
- CVSS
- 9.1 v4.0
- Published
- 20 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 th…
- Affected
- uv (pip) < 0.13.4
- Fix
- Upgrade uv to 0.13.4 or later.
- Exploitation
- No known exploitation
Story map
At a glance
uv: Amber, patch this week. 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 th…
The flaws
- GHSA-hq85-5cpj-mr62: Uv's bundled CA store trusts an emSign root whose intermediate CA keys are compromised (CVSS 9.1)
- CVE-2026-104843: Path traversal on Windows through wheel extraction (CVSS 5.9 · EPSS 0%)
- CVE-2026-114110: Uv vulnerable to arbitrary file deletion through RECORD entries (CVSS 5.3 · EPSS 0%)
The fix
Upgrade uv: 0.13.4 · 0.12.18 · 0.11.6 or later on your release line
Who is exposed: uv (pip) < 0.13.4
Where it stands
- No known exploitation
Connects to
- Same weakness: CWE-295 (CWE-295). 82 other warnings in 30 days
Why it is Amber
- CVSS 9.1 critical
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| uv | pip | < 0.13.4 | 0.13.4 |
References
- https://github.com/advisories/GHSA-hq85-5cpj-mr62
- https://github.com/astral-sh/uv/security/advisories/GHSA-hq85-5cpj-mr62
- https://github.com/certifi/python-certifi/security/advisories/GHSA-6q48-6c7w-9gw2
- https://emudhra.we-have-a-problem.com
- https://groups.google.com/a/mozilla.org/g/dev-security-policy/c/0R3XLJL6FuE/m/0XofdebrAAAJ
- https://github.com/advisories/GHSA-hq85-5cpj-mr62
Original description
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. uv 0.13.4 removes the root from its vendored bundle, following `webpki-root-certs` 1.0.10. Upgrade to 0.13.4 or later.
Last activity 20 Oct 2026. Patch Forecast updates every hour.