Improper Certificate Validation Affecting rustup package, versions <1.29.1~0-160000.1.1


Severity

Recommended
high

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-SLES1600-RUSTUP-20570828
  • published8 Oct 2026
  • disclosed2 Oct 2026

Introduced: 2 Oct 2026

NewCVE-2026-93601  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 rustup to version 1.29.1~0-160000.1.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rustup package and not the rustup package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1