Is CVE-2026-34872 actively exploited?

CVE-2026-34872 has no public evidence of in-the-wild exploitation as of 2026-04-03.

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

CVE-2026-34872 has a CVSS score of 9.1 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

How do I patch CVE-2026-34872?

Patch guidance is available from arm security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-34872.

Which products are affected by CVE-2026-34872?

2 products: arm mbed tls, arm tf-psa-crypto.

Fix CVE-2026-34872 - CRITICAL arm mbed tls

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).

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: CWE-347

Metadata

Primary Vendor: ARM
Published: 4/1/2026
Last Modified: 4/3/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-34872

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary