An issue was discovered in Mbed TLS 3.5.0 through 4.0.0.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 1, 2026 · NIST NVD

   Detected

   An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

2. Jun 17, 2026 · NIST NVD

   Updated

   An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

Affected

• cpe trustedfirmware/mbed tlsversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-34873

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-34873

  An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

  nvd.nist.gov

References

• Vendor Advisory · mbed-tls.readthedocs.io
• Vendor Advisory · mbed-tls.readthedocs.io