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CVE-2026-34877

Published: Apr 2, 2026Updated: Jun 5, 2026 Sources: CVE List NVDCWE-250
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.4%
Top 66.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-250CWE-502

Affected Products

n/an/a
mbed tlsarmOSS Libraries
mbed tlstrustedfirmware
On-premSecurity Product
Security Products / pki-crypto
armoss-projectGBOSS Librariesaka arm ltd
trustedfirmwarecommercialSecurity Productsaka mbed tls, op-tee, trusted firmware-a

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

5 techniques
Execution
Initial Access
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
Apr 2, 2026
Last Updated
Jun 5, 2026

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