WS-2026-0173
Published:October 20, 2026
Updated:October 23, 2026
uv 0.0.5 through 0.13.3 trusts the "emSign ECC Root CA - G3" root through its vendored webpki-root-certs/webpki-roots bundle. Intermediates under this root were revoked for key compromise, so certificates issued with the compromised CA keys are accepted by uv for any hostname, enabling man-in-the-middle attacks. Fixed in 0.13.4, which updates webpki-root-certs to 1.0.10 and removes the root.
Affected Packages
uv (PYTHON):
Affected version(s) >=0.0.5 <0.13.4Fix Suggestion:
Update to version 0.13.4Related Resources (3)
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Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity