Is CVE-2026-34872 actively exploited?

No active exploitation of CVE-2026-34872 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34872 be exploited remotely?

Yes. CVE-2026-34872 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34872?

CVE-2026-34872 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-34872

CWE-347Published: April 1, 2026· Updated: Apr 3, 2026

9.1

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.7th

Official 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).

NVD Source

Technical Analysis

CVE-2026-34872 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.