CVE-2026-107379
Received Received - Intake

Stored XSS via SVG DTD in savg-sanitizer

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-10-08
Last Modified
2026-10-08
Generated
2026-10-08
AI Q&A
2026-10-08
EPSS Evaluated
N/A
NVD
CVE-2026-107379
EUVD
EUVD-2026-95136

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
darylldoyle svg-sanitizer < 1.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

savg-sanitizer is a PHP library for sanitizing SVG/XML content. A flaw in versions before 1.0.0 allows an attacker to craft a malicious SVG file with a specific DTD that triggers double removal of an attribute. This corrupts the internal state of libxml and crashes the PHP worker process, leading to denial of service.

Detection Guidance

This vulnerability can be detected by checking the version of svg-sanitizer in use. If you are running a version prior to 1.0.0, the system is vulnerable. No specific commands are provided in the context to detect exploitation attempts.

Impact Analysis

If you use savg-sanitizer in your application to process user-uploaded SVG files, an attacker could exploit this to repeatedly crash your PHP workers. This could degrade application performance, exhaust server resources, or cause downtime by making the service unavailable.

Compliance Impact

This vulnerability primarily impacts availability and could lead to service disruptions. While not directly violating GDPR or HIPAA, repeated downtime may affect data processing timelines or availability of critical services, potentially leading to compliance issues depending on context.

Mitigation Strategies

Immediately upgrade svg-sanitizer to version 1.0.0 or later to address the vulnerability. Additionally, review and restrict access to SVG upload endpoints to trusted users only to reduce attack surface.

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