wolfSSL wolfSSL-py up to 5.8.2 Verify verify_mode missing authentication

Summaryinfo

A vulnerability classified as critical has been found in wolfSSL wolfSSL-py up to 5.8.2. Affected by this issue is some unknown functionality of the component Verify Handler. The manipulation of the argument verify_mode leads to missing authentication. This vulnerability is traded as CVE-2025-15346. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in wolfSSL wolfSSL-py up to 5.8.2 and classified as problematic. This issue affects some unknown processing of the component Verify Handler. The manipulation of the argument verify_mode with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is integrity. The summary by CVE is:

A vulnerability in the handling of verify_mode = CERT_REQUIRED in the wolfssl Python package (wolfssl-py) causes client certificate requirements to not be fully enforced.  Because the WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT flag was not included, the behavior effectively matched CERT_OPTIONAL: a peer certificate was verified if presented, but connections were incorrectly authenticated when no client certificate was provided.  This results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.  The issue affects versions up to and including 5.8.2.

The weakness was shared by Matan Radomski. The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-15346 since 12/30/2025. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 5.8.4-stable eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch b4517dece79f682a8f453abce5cfc0b81bae769d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• wolfSSL

Name

• wolfSSL-py

Version

• 5.8.0
• 5.8.1
• 5.8.2

License

• open-source

Website

• Product: https://github.com/wolfSSL/wolfssl-py/

CPE 2.3info

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CPE 2.2info

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