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CVE-2026-34875

CRITICAL CVSS 3.1: 9.8 EPSS 0.05%
Updated Apr 06, 2026
N/A
Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions 3.5.0 — 3.6.6
Fixed In 3.6.6
Type CWE-120 (Buffer Copy without Checking Size)
Vendor N/A
Public PoC No

An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in public key export for FFDH keys.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-120 Buffer Copy without Checking Size

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Arm Mbed_Tls
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
 3.5.0 3.6.6
Arm Tf-Psa-Crypto
cpe:2.3:a:arm:tf-psa-crypto:*:*:*:*:*:*:*:*
 — 1.1.0

References 2

https://mbed-tls.readthedocs.io/en/latest/security-advisories/
NVD
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-…
NVD
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