CVE catalog

CVE-2025-6496

tidy-html5: CVE-2025-6496

Severity: Medium
Published: Jun 23, 2025, 12:15:23 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.16% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	tidy-html5	sid	`2:5.8.0-2.1`	vulnerable
Debian	tidy-html5	forky	`2:5.8.0-2.1`	vulnerable
Debian	tidy-html5	trixie	`2:5.8.0-2`	vulnerable
Debian	tidy-html5	bookworm	`2:5.6.0-11`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tidy-html5	source	sid	`(unfixed)`	not yet assigned	Not reported	[1108235]
Debian	tidy-html5	source	forky	`(unfixed)`	not yet assigned	Not reported	[1108235]
Debian	tidy-html5	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1108235]
Debian	tidy-html5	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1108235]

[Debian bug #1108235]

Notes

[trixie] tidy-html5: Minor issue, revisit when fixed upstream [bookworm] tidy-html5: Minor issue, revisit when fixed upstream

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libtidy5deb1]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.6.0-11 · amd64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12
- 2:5.6.0-11 · arm64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12
[libtidy-dev]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.6.0-11 · amd64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12
- 2:5.6.0-11 · arm64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12
[tidy]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.6.0-11 · amd64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12
- 2:5.6.0-11 · arm64 · bookworm
  Affected
  dsa · tidy-html5 · debian · bookworm; dsa · tidy-html5 · debian · 12

[Debian 13 (Trixie)]

[libtidy58]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.8.0-2 · amd64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13
- 2:5.8.0-2 · arm64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13
[libtidy-dev]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.8.0-2 · amd64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13
- 2:5.8.0-2 · arm64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13
[tidy]Affected
Source package: [tidy-html5]
Details (2)
- 2:5.8.0-2 · amd64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13
- 2:5.8.0-2 · arm64 · trixie
  Affected
  dsa · tidy-html5 · debian · 13

Observed: Oct 24, 2026, 9:37:56 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]