CVE-2025-6496 HTACG tidy-html5 parser.c InsertNodeAsParent null pointer dereference
A local attacker can cause a denial of service in the tidy-html5 library via a null pointer dereference in the parser.
- 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-2025-6496?
CVE-2025-6496 is a medium-severity 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 was found in HTACG tidy-html5 5.8.0. It has been declared as problematic. This vulnerability affects the function InsertNodeAsParent of the file src/parser.c. The manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-6496?
How do I fix CVE-2025-6496?
No fix has been published for CVE-2025-6496 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-6496 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6496 exists.
Sources
Also known as DEBIAN-CVE-2025-6496, GHSA-8cw2-hw77-mrmj, UBUNTU-CVE-2025-6496.