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CVE-2026-93601— rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass

Quick assessment

Affected
rustls webpki
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rustls-webpki（rustls 所使用的 webpki 的 Rust 分支）在版本 >= 0.101.0 且 < 0.103.12 以及 < 0.104.0-alpha.6 中，错误地接受了证书声明通配符名称时的“允许子树”DNS 名称约束。例如，名为 accept.example.com 的名称约束会被 *.example.com 的证书满足，而该证书可能声明 reject.example.com —— 这是一个位于允许子树之外的名称。由于名称约束是针对其他方面正确签发的证书所施加的限制，该问题仅在签名

CVSS 2.2 · Low

Affected Version Matrix 2

VendorProduct Version RangeStatus
rustls webpki 0.101.0< 0.103.12 affected
0.104.0-alpha.1< 0.104.0-alpha.6 affected
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I. Basic Information for CVE-2026-93601

Vulnerability Information
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Vulnerability Title
rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustls webpki 0.101.0 ~ 0.103.12 -

II. Public POCs for CVE-2026-93601

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III. Intelligence Information for CVE-2026-93601

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Other References for CVE-2026-93601 (2)

Same Patch Batch · rustls · 2026-09-18 · 4 CVEs total

CVE-2026-93599 7.5 HIGH rustls-webpki before 0.103.13 Panic via empty BIT STRING
CVE-2026-93602 4.4 MEDIUM rustls-webpki before 0.103.10 CRL Revocation Check Bypass
CVE-2026-93600 2.2 LOW rustls webpki Name Constraints URI Validation Bypass

IV. Related Vulnerabilities

Same product: webpki
Same vendor: rustls
Same weakness: CWE-295

V. Comments for CVE-2026-93601

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