CVE-2025-6498 HTACG tidy-html5 alloc.c defaultAlloc memory leak
A memory leak in the defaultAlloc function of tidy-html5 allows local attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-6498?
CVE-2025-6498 is a medium-severity denial of service vulnerability in HTACG tidy-html5, published on 23 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-6498?
It affects 1 product.
Products include Htacg Tidy.
How do I fix CVE-2025-6498?
No fix has been published for CVE-2025-6498 yet. Limit exposure of the affected software until one is available.
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-2025-6498 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6498 exists.
Other vulnerabilities in HTACG tidy-html5
Sources
Also known as AZL-64314, AZL-64320, DEBIAN-CVE-2025-6498, GHSA-449v-6j3r-mxhj, UBUNTU-CVE-2025-6498.