CVE-2026-121444
Deferred Deferred - Pending Action

SVG Use Reference Graph DoS in svg-sanitizer

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: VulnCheck

Description
svg-sanitizer from 0.11.0 before 1.1.0 contains an algorithmic complexity denial of service vulnerability in hasInfiniteLoop() and countUse() of the use reference-graph analysis. Attackers can upload a small layered SVG with 15 levels of fanned-out use elements, forcing exponential path enumeration that pins PHP workers for hours.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-121444
EUVD
EUVD-2026-115866

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
darylldoyle svg-sanitizer 0.11.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability is an algorithmic complexity denial of service in the svg-sanitizer library versions 0.11.0 to 1.1.0. It involves a flaw in the hasInfiniteLoop() and countUse() functions that analyze SVG use element references. Attackers can exploit this by uploading a specially crafted SVG file with 15 layers of nested use elements, causing exponential path enumeration that consumes excessive server resources.

Impact Analysis

This vulnerability can cause severe service disruption by consuming excessive CPU and memory resources. PHP workers may become pinned for hours, leading to degraded performance or complete unavailability of web services relying on svg-sanitizer. Even small malicious SVG files can trigger this issue.

Mitigation Strategies

Upgrade svg-sanitizer to version 1.1.0 or later to address the algorithmic complexity denial of service vulnerability in hasInfiniteLoop() and countUse().

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