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MbedTLS Security Audit Reveals Vulnerabilities in Major Update

MbedTLS Security Audit Reveals Vulnerabilities in Major Update

First seen 20 Oct 2026, 19:46 UTC • •
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ThreatCluster AI
ThreatCluster •October 20, 2026 at 20:48 UTC
  • •OSTIF commissioned a security audit of MbedTLS due to significant architectural changes.
  • •The audit revealed one high-severity vulnerability and several other issues.
  • •MbedTLS maintainers have addressed the reported vulnerabilities to improve security.

The Open Source Technology Improvement Fund (OSTIF) announced the completion of a security audit for MbedTLS, focusing on the transition from version 3.x to 4.0. Conducted by Quarkslab, the audit assessed architectural changes, including the integration of the TF-PSA-Crypto library. The review identified one high-severity vulnerability, along with one low and three informational issues. Key areas of concern included SSL/DTLS context management, PSA API integration, and X.509 parsing. The MbedTLS maintainers have reportedly worked to resolve the identified issues, enhancing the security posture of the library. The audit findings were made public on October 20, 2026, following the completion of the review in early 2026.

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Timeline

2026-10-19
Quarkslab publishes audit details
Quarkslab provided a detailed analysis of the MbedTLS security audit, focusing on architectural changes and security implications.
Blog.Quarkslab
2026-10-20
OSTIF announces audit completion
OSTIF published the results of the MbedTLS security audit, highlighting findings and improvements made by maintainers.
ostif.org
Early 2026
Security audit conducted
Quarkslab performed a comprehensive security audit of MbedTLS, evaluating the transition from version 3.x to 4.0.
ostif.org

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Common questions

What vulnerabilities were found in the audit?
The audit identified one high-severity vulnerability, one low-severity, and three informational issues.
What actions have the MbedTLS maintainers taken?
The maintainers have worked to resolve the issues reported during the audit to enhance security.
When was the audit completed?
The audit was completed in early 2026, with results published on October 20, 2026.