An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 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 2, 2026 · NIST NVD

   Detected

   An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.

2. Jul 24, 2026 · NIST NVD

   Updated

   An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.

Affected

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

Sources

• CVE.orgVulnerability recordCVE-2026-34877

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-34877

  An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code executi

  nvd.nist.gov

References

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