CVE-2026-121443

Medium

Description

svg-sanitizer from 1.1.0 before 1.1.1 contains a denial of service vulnerability that allows remote attackers to crash requests by submitting SVG input ending inside an unclosed tag. Attackers can upload truncated input like a single '<' to trigger an uncaught ValueError from strpos() in hasElementWithTooManyAttributes() or hasInternalDtdSubset() on PHP 8, failing the request.

SeverityMedium

CVSS5.3

Exploit probability—

ProductDarylldoyle Svg-sanitizer

PublishedNov 3, 2026

First seenNov 4, 2026

Weakness typeCWE-248CWE-248

How to fix

Update

darylldoyle svg-sanitizer1.1.1 or later

Vendor advisories

github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-f7cw-vfxq-7ph2

Affected products

Product	Affected versions	Fixed in
darylldoyle svg-sanitizer	1.1.0 ≤ v < 1.1.1	1.1.1

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