Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121443svg-sanitizer from 1.1.0 before 1.1.1 Denial of Service via Unclosed Tag

Medium 5.3

In plain English

A medium-severity security flaw in svg-sanitizer from darylldoyle. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 77.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
darylldoyle	svg-sanitizer	1.1.0 – before 1.1.1

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-f7cw-vfxq-7ph2) vendor-advisory
VulnCheck Advisory: svg-sanitizer from 1.1.0 before 1.1.1 Denial of Service via Unclosed Tag third-party-advisory