CVE-2026-45066

Name	CVE-2026-45066
Description	Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6312-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
symfony (PTS)	bookworm, bookworm (security)	5.4.53+dfsg-0+deb12u1	fixed
	trixie (security), trixie	6.4.41+dfsg-0+deb13u1	fixed
	forky, sid	7.4.18+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
symfony	source	bullseye	(not affected)
symfony	source	bookworm	(not affected)
symfony	source	trixie	6.4.41+dfsg-0+deb13u1	DSA-6312-1
symfony	source	(unstable)	7.4.12+dfsg-1

Notes

[bookworm] - symfony <not-affected> (Vulnerable code not present, introduced in 6.1)
[bullseye] - symfony <not-affected> (Vulnerable code not present, introduced in 6.1)
https://symfony.com/blog/cve-2026-45066-htmlsanitizer-allowlinkhosts-allowmediahosts-bypass-via-url-parser-differentials-and-area-misclassification