CVE-2024-45801: Tampering by prototype polution in DOMPurify

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-16 · updated 2026-06-17
Weakness: CWE-1333

Description

DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It has been discovered that malicious HTML using special nesting techniques can bypass the depth checking added to DOMPurify in recent releases. It was also possible to use Prototype Pollution to weaken the depth check. This renders dompurify unable to avoid cross site scripting (XSS) attacks. This issue has been addressed in versions 2.5.4 and 3.1.3 of DOMPurify. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

cure53 DOMPurify: before 2.5.4; from 3.0.0 before 3.1.3 — fixed in 2.5.4, 3.1.3

How to fix

Upgrade to a fixed version: cure53 DOMPurify 2.5.4, 3.1.3. Check the vendor advisory for mitigations.

References

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