An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack of contributory behavior in FFDH due to improper input validation. Using finite-field Diffie-Hellman, the other party can force the shared secret into a small set of values (lack of contributory behavior). This is a problem for protocols that depend on contributory behavior (which is not the case for TLS). The attack can be carried by the peer, or depending on the protocol by an active network attacker (person in the middle).
References
| Link | Resource |
|---|---|
| https://mbed-tls.readthedocs.io/en/latest/security-advisories/ | Vendor Advisory |
| https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-peerkey-checks/ | Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
03 Apr 2026, 20:02
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Arm tf-psa-crypto
Arm Arm mbed Tls |
|
| CPE | cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* cpe:2.3:a:arm:tf-psa-crypto:1.0.0:-:*:*:*:*:*:* |
|
| References | () https://mbed-tls.readthedocs.io/en/latest/security-advisories/ - Vendor Advisory | |
| References | () https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-peerkey-checks/ - Mitigation, Vendor Advisory |
01 Apr 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-01 20:16
Updated : 2026-04-03 20:02
NVD link : CVE-2026-34872
Mitre link : CVE-2026-34872
CVE.ORG link : CVE-2026-34872
JSON object : View
Products Affected
arm
- mbed_tls
- tf-psa-crypto
CWE
CWE-347
Improper Verification of Cryptographic Signature