---
id: CVE-2026-121443
title: svg-sanitizer from 1.1.0 before 1.1.1 Denial of Service via Unclosed Tag
summary: >-
  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 '<'…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-248
vendor: darylldoyle
product: svg-sanitizer
affected:
  - svg-sanitizer >= 1.1.0 < 1.1.1
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T14:28:33.308Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121443'
references:
  - url: >-
      https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-f7cw-vfxq-7ph2
    label: GitHub Security Advisory (GHSA-f7cw-vfxq-7ph2)
  - url: >-
      https://www.vulncheck.com/advisories/svg-sanitizer-from-1.1.0-before-1.1.1-denial-of-service-via-unclosed-tag
    label: >-
      VulnCheck Advisory: svg-sanitizer from 1.1.0 before 1.1.1 Denial of
      Service via Unclosed Tag
tags:
  - cve.org
epss: 0.00301
epssPercentile: 0.22936
ingestedAt: '2026-11-05T19:30:42.970Z'
---

## Overview

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.

## Affected

- `svg-sanitizer >= 1.1.0 < 1.1.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.