CVE-2026-56410 Integer overflow in libexpat
An integer overflow in libexpat's xmlwf tool can lead to denial of service, affecting applications using the library for XML processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56410?
CVE-2026-56410 is a medium-severity vulnerability in Libexpat Project Libexpat, published on 21 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.
Weakness: CWE-190
Which versions are affected by CVE-2026-56410?
It affects 1 product.
Products include Libexpat Project Libexpat.
How do I fix CVE-2026-56410?
Upgrade to a fixed version.
Is CVE-2026-56410 being exploited?
There is no known exploitation of CVE-2026-56410 in the wild and no public exploit code.
Other vulnerabilities in Libexpat Project Libexpat
Sources
Also known as ALPINE-CVE-2026-56410, AZL-90252, BELL-CVE-2026-56410, DEBIAN-CVE-2026-56410, ECHO-cbd2-a00b-644f, GHSA-638v-9w3r-gh6q and 3 more.