Buffer overflow in mbed TLS - CVE-2026-34875
Published: April 2, 2026
Vulnerability identifier: #VU124804
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-34875
CWE-ID: CWE-120
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ARM
Affected software:
mbed TLS
mbed TLS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper input validation in the psa_export_public_key() function when processing FFDH public key export requests. A remote attacker can send a specially crafted request with a small output buffer to cause memory corruption and potentially execute arbitrary code.
Applications exporting public keys for algorithms other than FFDH are not affected.
How to mitigate CVE-2026-34875
Install security update from vendor's website.