CVE-2026-93601

[CVE catalog]

Severity

Medium · CVSS 4.4CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Published

Sep 18, 2026, 1:20:11 PM UTC

Updated

Sep 23, 2026, 11:40:09 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.20% · Oct 25, 2026

rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.