CVE-2025-66382 Denial of service in libexpat
An attacker can cause significant processing delays and potential service unavailability by submitting a crafted XML file to applications using libexpat.
- 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-2025-66382?
CVE-2025-66382 is a low-severity denial of service vulnerability in Libexpat Project Libexpat, published on 28 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.
Weakness: CWE-407
Which versions are affected by CVE-2025-66382?
It affects 1 product.
Linux distribution packages (1)
tdom openSUSE:Tumbleweed | All versions | 0.9.6-1.1 |
Products include Libexpat Project Libexpat.
How do I fix CVE-2025-66382?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-66382 being exploited?
There is no known exploitation of CVE-2025-66382 in the wild and no public exploit code.
Other vulnerabilities in Libexpat Project Libexpat
Sources
Also known as AZL-71054, AZL-72814, DEBIAN-CVE-2025-66382, ECHO-cb91-04ae-ba17, GHSA-93q9-crcw-vwgq, JLSEC-2026-378 and 2 more.