What is CVE-2026-34875?

CVE-2026-34875 is a critical-severity vulnerability in Arm Tf-psa-crypto, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-04-01.

How severe is CVE-2026-34875?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Arm Tf-psa-crypto

CVE-2026-34875

An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in public key export for FFDH keys.

Vulnerability class: Buffer Overflow

EPSS: 0.001 (18.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Arm Tf-psa-crypto
Trustedfirmware Mbed_tls
Trustedfirmware Tf-psa-crypto
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Vendor Advisory)
cve@mitre.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-34875?: CVE-2026-34875 is a critical-severity vulnerability in Arm Tf-psa-crypto, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-04-01.
How severe is CVE-2026-34875?: Critical severity. CVSS v3 base score is 9.8 out of 10.