Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

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

   Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

2. Jun 17, 2026 · NIST NVD

   Updated

   Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

Affected

• cpe trustedfirmware/mbed tlsversion unspecified
• cpe trustedfirmware/mbed tls4.0.0

Sources

• CVE.orgVulnerability recordCVE-2026-25834

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-25834

  Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

  nvd.nist.gov

References

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