CVE-2026-25833 Memory corruption in n/a

High 7.5 Published 1 Apr 2026 Updated 1 Apr 2026

A buffer overflow in Mbed TLS allows attackers to execute arbitrary code or cause denial of service via crafted IPv6 addresses.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-25833?

CVE-2026-25833 is a high-severity memory corruption vulnerability in n/a, published on 1 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-121

Which versions are affected by CVE-2026-25833?

It affects 1 product.

Products include Trustedfirmware Mbed Tls.

How do I fix CVE-2026-25833?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-25833 being exploited?

There is no known exploitation of CVE-2026-25833 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2026-25833, DEBIAN-CVE-2026-25833, ECHO-bdd6-92e0-39bb, GHSA-jr87-qch5-gjc6, UBUNTU-CVE-2026-25833.