CVE-2026-34872
Mbed TLS vulnerability analysis and mitigation

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).


SourceNVD

Related Mbed TLS vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-34877CRITICAL9.8
  • Mbed TLSMbed TLS
  • mbedtls
NoYesApr 02, 2026
CVE-2026-34873CRITICAL9.1
  • Mbed TLSMbed TLS
  • mbedtls-devel
NoYesApr 01, 2026
CVE-2026-34872CRITICAL9.1
  • Mbed TLSMbed TLS
  • cpe:2.3:a:arm:mbed_tls
NoYesApr 01, 2026
CVE-2026-34876HIGH7.5
  • Mbed TLSMbed TLS
  • mbedtls
NoYesApr 02, 2026
CVE-2025-66442MEDIUM5.1
  • Mbed TLSMbed TLS
  • mbedtls
NoNoApr 01, 2026

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