NULL pointer dereference in Htacg Tidy-Html5
CVE-2025-6496
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (4.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Htacg Tidy-Html5 — versions 5.8.0
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/htacg/tidy-html5/issues/1141 (issue-tracking)
- github.com/user-attachments/files/19652942/tidy-html5_crash.txt (exploit)
Frequently asked questions
- What is CVE-2025-6496?
- CVE-2025-6496 is a low-severity vulnerability in Htacg Tidy-Html5, classified under Improper Resource Shutdown or Release. CVSS score: 3.3/10. Published 2025-06-23.
- How severe is CVE-2025-6496?
- Low severity. CVSS v3 base score is 3.3 out of 10.