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RUSTSEC-2026-0098

Name constraints for URI names were incorrectly accepted

Reported
Issued
Package
rustls-webpki (crates.io)
Type
Vulnerability
Keywords
#name-constraints #x509
Aliases
Patched
  • >=0.103.12, <0.104.0-alpha.1
  • >=0.104.0-alpha.6

Description

Name constraints for URI names were ignored and therefore accepted.

Note this library does not provide an API for asserting URI names, and URI name constraints are otherwise not implemented. URI name constraints are now rejected unconditionally.

Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.

This vulnerability is identified as GHSA-965h-392x-2mh5. Thank you to @1seal for the report.

Advisory available under CC0-1.0 license.