Vulnerability-Lookup

GHSA-VJ87-JJ27-4H9C

Vulnerability from github – Published: 2026-01-08 00:31 – Updated: 2026-01-08 20:57

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.

Severity ?

9.3 (Critical)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "wolfssl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.8.4-stable"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-15346"
  ],
  "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"
  },
  "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.\u00a0\n\nBecause 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.\u00a0\n\nThis results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.\u00a0\n\nThe issue affects versions up to and including 5.8.2.",
  "id": "GHSA-vj87-jj27-4h9c",
  "modified": "2026-01-08T20:57:58Z",
  "published": "2026-01-08T00:31:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15346"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl-py/pull/62"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wolfSSL/wolfssl-py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stable"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "wolfSSL Python module vulnerable to Improper Authentication"
}

CVE-2025-15346 (GCVE-0-2025-15346)

Vulnerability from cvelistv5 – Published: 2026-01-07 23:32 – Updated: 2026-01-08 19:22 X_Open Source

Title

wolfSSL Python library `CERT_REQUIRED` mode fails to enforce client certificate requirement

Summary

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.

Severity ?

9.3 (Critical)


                        
                          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/AU:Y

CWE

CWE-306 - Missing Authentication for Critical Function
CWE-287 - Improper Authentication

Assigner

wolfSSL

References

URL

Tags

	https://github.com/wolfSSL/wolfssl-py/pull/62
	https://github.com/wolfSSL/wolfssl-py/commit/b451…
	https://github.com/wolfSSL/wolfssl-py/releases/ta…

Impacted products

	Vendor	Product	Version
	wolfSSL	wolfSSL-py	Affected: 5.3.0 , ≤ 5.8.2 (python)

Credits

Matan Radomski

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VJ87-JJ27-4H9C

CVE-2025-15346 (GCVE-0-2025-15346)

Tags

Sightings

Nomenclature