GHSA-vj87-jj27-4h9c

Source

https://github.com/advisories/GHSA-vj87-jj27-4h9c

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-vj87-jj27-4h9c/GHSA-vj87-jj27-4h9c.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-vj87-jj27-4h9c

Aliases

Published

2026-01-08T00:31:15Z

Modified

2026-06-29T12:26:49Z

Severity

9.3 (Critical) CVSS_V4 - 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 CVSS Calculator

Summary

wolfSSL Python module vulnerable to Improper Authentication

Details

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.

Database specific

{
    "cwe_ids":  [
        "CWE-287"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-01-08T20:57:58Z",
    "nvd_published_at":  "2026-01-08T00:15:59Z",
    "severity":  "CRITICAL"
}

References

Affected packages

PyPI / wolfssl

Package

Name: wolfssl; View open source insights on deps.dev
Purl: pkg:pypi/wolfssl

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

5.8.4.post0

Affected versions

0.*

0.1.0

0.1.1

0.1.2

3.*

3.12.2.post0

3.13.0.post0

3.13.0.post1

3.14.0.post1

4.*

4.1.0.post0

5.*

5.3.0.post0

5.4.0.post0

5.5.3.post0

5.5.4.post0

5.6.0.post0

5.6.6.post0

5.7.2.post0

5.7.4.post0

5.8.2.post0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-vj87-jj27-4h9c/GHSA-vj87-jj27-4h9c.json"