An issue was discovered in Mbed TLS through 3.6.5 and 4.x 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 through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.

2. Jun 17, 2026 · NIST NVD

   Updated

   An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.

Affected

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

Sources

• CVE.orgVulnerability recordCVE-2026-34874

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-34874

  An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.

  nvd.nist.gov

References

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