Is CVE-2026-121443 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121443?

CVE-2026-121443 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-121443

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.