CVE-2026-107380

MediumCVSS 5.4

Published: 08/10/2026(UTC)Updated: 09/10/2026(UTC)Translated: 09/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.21%

10th percentile - higher than 10% of all known CVEs

Summary

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, isHrefSafeValue() validates an SVG href after XML DTD entity expansion, but saveXML() serializes the original entity reference after removing the DTD declaration. A crafted entity such as Tab can appear to the sanitizer as a safe fragment prefix while HTML5 Named Character Reference resolution during inline HTML rendering later converts the surviving reference to whitespace, exposing a javascript: URL. When an application embeds the sanitized SVG inline, a user who activates the link can cause script to execute in the embedding page's origin. This issue is fixed in version 1.0.0.

Risk Assessment

Risk of script execution in the page context (XSS) after a user clicks a link, potentially leading to session theft, account takeover, or other attacks on users.

Recommendation

Upgrade svg-sanitizer to version 1.0.0 or later. If not possible, avoid inline SVG embedding and apply additional XSS protections.

Other vulnerabilities in savg-sanitizer

CVE-2026-107379Medium
savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, a crafted SVG DTD with a #FIXED attribute default can 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.

Original NVD description (English source)

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer's isHrefSafeValue() validates an SVG href after XML DTD entity expansion, but saveXML() serializes the original entity reference after removing the DTD declaration. A crafted entity such as Tab can appear to the sanitizer as a safe fragment prefix while HTML5 Named Character Reference resolution during inline HTML rendering later converts the surviving reference to whitespace, exposing a javascript: URL. When an application embeds the sanitized SVG inline, a user who activates the link can cause script to execute in the embedding page's origin. This issue is fixed in version 1.0.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS