rustls rustls-webpki up to 0.103.11/0.104.0-alpha.5 privileges management

Summaryinfo

A vulnerability classified as problematic has been found in rustls rustls-webpki up to 0.103.11/0.104.0-alpha.5. Affected is an unknown function. The manipulation leads to privileges management. This vulnerability is listed as CVE-2026-93601. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in rustls rustls-webpki up to 0.103.11/0.104.0-alpha.5. It has been rated as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-93601 since 09/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 0.103.12 or 0.104.0-alpha.6 eliminates this vulnerability.

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Productinfo

Vendor

• rustls

Name

• rustls-webpki

Version

• 0.103.0
• 0.103.1
• 0.103.2
• 0.103.3
• 0.103.4
• 0.103.5
• 0.103.6
• 0.103.7
• 0.103.8
• 0.103.9
• 0.103.10
• 0.103.11
• 0.104.0-alpha.0
• 0.104.0-alpha.1
• 0.104.0-alpha.2
• 0.104.0-alpha.3
• 0.104.0-alpha.4
• 0.104.0-alpha.5

CPE 2.3info

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CPE 2.2info

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