Critical severity9.8NVD Advisory· Published Apr 2, 2026· Updated Apr 6, 2026

CVE-2026-34877

Description

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 products

Arm/Mbed Tls2 versions
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*range: >=2.19.0,<3.6.6
- cpe:2.3:a:arm:mbed_tls:4.0.0:*:*:*:*:*:*:*

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

mbed-tls.readthedocs.io/en/latest/security-advisories/nvdVendor Advisory
mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-serialized-data/nvdVendor Advisory

News mentions

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