Buffer Overflow Vulnerability in Mbed TLS Affecting Multiple Versions
CVE-2026-34875

9.8CRITICAL

Key Information:

Vendor

ARM
Status
Mbed TLS
Vendor
CVE Published:
1 April 2026

What is CVE-2026-34875?

A buffer overflow vulnerability has been identified in Mbed TLS affecting versions up to 3.6.5 and TF-PSA-Crypto 1.0.0. This issue arises during the export of public keys for FFDH (Finite Field Diffie-Hellman) keys, leading to potential exploitation. Malicious actors may leverage this flaw to manipulate memory, which could result in unforeseen consequences for the application utilizing these cryptographic functions. Users are strongly encouraged to review their implementations and apply the necessary patches or mitigations to ensure security.

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References

https://mbed-tls.readthedocs.io/en/latest/security-adviso...
https://mbed-tls.readthedocs.io/en/latest/security-adviso...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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