enshrined/svg-sanitize: Denial of Service via DTD Attribute Declaration Crash

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer allows a crafted SVG DTD with a #FIXED attribute default to make cleanAttributesOnWhitelist() perform a double DOMElement::removeAttribute() call on the same attribute name in src/Sanitizer.php. The first removal deletes the explicit attribute, while the DTD default rematerializes the value before the href safety path performs the second removal, which can corrupt libxml state and terminate the PHP worker. An attacker who can submit SVG content to a sanitization endpoint can repeatedly interrupt workers and degrade or exhaust application availability. This issue is fixed in version 1.0.0.

[ Fixes ]Fixes and patches

• enshrined/svg-sanitize 1.0.0Fixed version · GitHub Advisories · composer package enshrined/svg-sanitize: upgrade to 1.0.0 or later (affected <= 0.22.0)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4047

  Snipe-IT: Multiple vulnerabilities Translated from German

  CVE-2026-109413CVE-2026-55599CVE-2026-45073+9 more CVEs

[ Packages ]Affected open-source packages

• enshrined/svg-sanitize composerAffected <= 0.22.0 · fixed in 1.0.0 · GHSA-v383-3rw5-q8rf

[ References ]References

• github.com/darylldoyle/svg-sanitizer/commit/23877db7e76f1e1df5c3e65ab30239219c3d2867
• github.com/darylldoyle/svg-sanitizer/releases/tag/1.0.0
• github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-v383-3rw5-q8rf