PT-2026-29589 · Arm · Mbed Tls+1

0Xiviel + 1 · Published 2026-04-01 · Updated 2026-05-07 · CVE-2026-34872

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Mbed TLS versions 3.5.x and 3.6.x through 3.6.5 TF-PSA-Crypto version 1.0

Description A flaw exists due to improper input validation in Finite-Field Diffie-Hellman (FFDH), leading to a lack of contributory behavior. An attacker can manipulate the shared secret to a limited set of values. This is a concern for protocols relying on contributory behavior. The attack can be initiated by the peer or an active network attacker.

Recommendations Update Mbed TLS to a version later than 3.6.5. Update TF-PSA-Crypto to a version later than 1.0.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-34872

ECHO-8E44-1E55-58A6

JLSEC-2026-466

OPENSUSE-SU-2026:10498-1

Affected Products

Mbed Tls

Tf-Psa-Crypto

References · 23

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-34872 · Vendor Advisory
• 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 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-34872 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-34872 · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2026-466 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34872 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-34872 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-34872 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10498-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-34872 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-34876 · Note
• https://suse.com/security/cve/CVE-2026-34871 · Note
• https://suse.com/security/cve/CVE-2026-34872 · Note
• https://suse.com/security/cve/CVE-2026-25835 · Note