Description

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).

INFO

Published Date :

2026-04-01T00:00:00.000Z

Last Modified :

2026-04-01T19:52:25.548Z

Source :

mitre
AFFECTED PRODUCTS

The following products are affected by CVE-2026-34872 vulnerability.

Vendors Products
Arm
  • Mbed Tls
  • Tf-psa-crypto
Mbed-tls
  • Mbedtls
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34872.

URL Resource
https://mbed-tls.readthedocs.io/en/latest/security-advisories/ cve-icon cve-icon cve-icon
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-peerkey-checks/ cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-34872 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-34872 cve-icon
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