CVE-2025-15346 — Vulnerability in wolfssl — CVE Details
CRITICAL
wolfSSL Python module vulnerable to Improper Authentication
Published June 29, 2026Updated July 1, 2026Source: osv
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.
Advisory Timeline
- First published June 29, 2026 (105 days ago).
- Last revised July 1, 2026 — 2 days after initial publication.
Remediation
Upgrade to the fixed version using your package manager.
pip
Update wolfssl to 5.8.4.post0 or laterpip install "wolfssl>=5.8.4.post0"
After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.
Affected Packages (1)
Affects 1 ecosystem: pypi (1).
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| wolfssl | pypi | 0.1.0, 0.1.1, 0.1.2, 3.12.2.post0 (+13 more) | 5.8.4.post0 |
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—
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
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-15346ADVISORY
- https://github.com/wolfSSL/wolfssl-py/pull/62WEB
- https://github.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769dWEB
- https://github.com/wolfSSL/wolfssl-pyPACKAGE
- https://github.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stableWEB
- https://pypi.org/project/wolfsslPACKAGE
- https://github.com/advisories/GHSA-vj87-jj27-4h9cADVISORY
Frequently Asked Questions
- What is CVE-2025-15346?
- wolfSSL Python module vulnerable to Improper Authentication This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
- How do I check if my project is affected by CVE-2025-15346?
- CVE-2025-15346 affects wolfssl. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-15346 and 200,000+ other known vulnerabilities.
Severity & Exploitability
CVSS Score
9.1
Exploitation is straightforward and causes maximum impact. Patch immediately.
Also Known As
PYSEC-2026-575
GHSA-vj87-jj27-4h9c
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