wolfSSL Python module vulnerable to Improper Authentication
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | wolfssl | < 5.8.4.post0 | 5.8.4.post0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-15346
- https://github.com/wolfSSL/wolfssl-py/pull/62
- https://github.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769d
- https://github.com/wolfSSL/wolfssl-py
- https://github.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stable
- https://pypi.org/project/wolfssl
- https://github.com/advisories/GHSA-vj87-jj27-4h9c
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-287- Platform
- Python (PyPI)
- Package
wolfssl- Disclosed
- 08.01.2026
- Updated
- 11.10.2026 13:17
Sources and licenses
OSV / GitHub Advisory Database - GHSA-vj87-jj27-4h9c - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-575 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: wolfssl
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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