What is CVE-2026-25833?

CVE-2026-25833 is a high-severity vulnerability in Trustedfirmware Mbed_tls, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-01.

How severe is CVE-2026-25833?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Trustedfirmware Mbed_tls

CVE-2026-25833

Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function

Vulnerability class: Buffer Overflow

EPSS: 0.001 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Trustedfirmware Mbed_tls — versions 4.0.0
N/a — versions n/a

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-25833?: CVE-2026-25833 is a high-severity vulnerability in Trustedfirmware Mbed_tls, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-01.
How severe is CVE-2026-25833?: High severity. CVSS v3 base score is 7.5 out of 10.