CVE-2026-93600
rustls webpki Name Constraints URI Validation Bypass
- State
- Published
- Severity
- 2.1 Low
- Published
- Sep 18, 2026
- Updated
- Sep 21, 2026
- Reserved
- Sep 18, 2026
Description
rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.1 Low | CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 2.2 Low | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
webpkirustls |
|
References
- GitHub Security Advisory (GHSA-965h-392x-2mh5)vendor-advisory
- VulnCheck Advisory: rustls webpki Name Constraints URI Validation Bypassthird-party-advisory
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