Vulnerability in Darylldoyle Svg-Sanitizer
CVE-2026-121443
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-f7cw-vfxq-7ph2 (vendor-advisory)
- www.vulncheck.com/advisories/svg-sanitizer-from-1.1.0-before-1.1.1-denial-of-se… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121443?
- CVE-2026-121443 is a medium-severity vulnerability in Darylldoyle Svg-Sanitizer, classified under CWE-248. CVSS score: 5.3/10. Published 2026-11-03.
- How severe is CVE-2026-121443?
- Medium severity. CVSS v3 base score is 5.3 out of 10.