Critical severity9.8NVD Advisory· Published Apr 2, 2026· Updated Jun 5, 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Arm/MbedTLS3 versions
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*range: >=2.19.0,<3.6.6
- cpe:2.3:a:trustedfirmware:mbed_tls:4.0.0:*:*:*:*:*:*:*
- (no CPE)range: from 2.19.0 up to 3.6.5, 4.0.0
osv-coords
pkg:rpm/opensuse/mbedtls&distro=openSUSE%20Tumbleweed
Range: < 3.6.6-1.1

Patches

Vulnerability mechanics

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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cvss	0.637
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000