9.8

CVE-2026-34875: trustedfirmware mbed_tls Classic Buffer Overflow

CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-34875DEBIAN-CVE-2026-34875
Published 01-04-2026Last modified 01-04-2026
Open JSON

Vulnerability summary

CVE-2026-34875 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in trustedfirmware mbed_tls. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 47.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.60%
0%100%
Low · +0.23 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:10498-1

Timeline

  1. 01-04-2026
    PublishedVulnerability first disclosed.
  2. 01-04-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

+0.23 pp

From 0.37% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.60%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Trustedfirmware2 products
Debian1 product
  • mbedtlsAll versions (No fix recorded) | < 3.6.6-0.1~deb13u1 | < 3.6.6-0.1
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

3 vendors · 4 products

References

5 links