CVE-2026-116804

DOMPurify from 3.4.4 before 3.4.17 SAFE_FOR_TEMPLATES Bypass via Shadow Root Content

publishedCWE-79

DOMPurify from 3.4.4 before 3.4.17 contains a SAFE_FOR_TEMPLATES bypass that lets attackers preserve template expressions in attached shadow roots when using RETURN_DOM, RETURN_DOM_FRAGMENT, or IN_PLACE modes. Attackers can split expressions across text nodes separated by disallowed elements, which merge after removal and are evaluated by downstream template engines for cross-site scripting.

Technical severity5.1 mediumCVSS 4.0 · CNA: VulnCheck

Published2026-10-26Source updated 2026-11-02

Collected2026-11-023 attributed sources

Fixes and workarounds

Fix

dompurify (npm): OSV reports a fixed version 3.4.17. Check the advisory for supported release branches.

Source: OSV GHSA-cg2g-xh64-v4q7

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
DOMPurify cure53 `dompurify` npm	≥ 3.4.4; < 3.4.17 (affected, semver) 3.4.17 (unaffected, semver) Other versions: unaffected	CNA: VulnCheck
dompurify `dompurify` npm	≥ 3.4.4; < 3.4.17 (affected, semver); OSV events: introduced 3.4.4; fixed 3.4.17 Source events (semver) `[ { "introduced": "3.4.4" }, { "fixed": "3.4.17" } ]` Other versions: unaffected	OSV GHSA-cg2g-xh64-v4q7

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 5.1 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`	CNA: VulnCheck
3.1 / 6.1 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`	CNA: VulnCheck

Exploit evidence

https://github.com/cure53/DOMPurify/security/advisories/GHSA-cg2g-xh64-v4q7
exploit · ADP: CISA-ADP

References

https://github.com/cure53/DOMPurify/security/advisories/GHSA-cg2g-xh64-v4q7CNA: VulnCheck · vendor-advisory
https://www.vulncheck.com/advisories/dompurify-from-3.4.4-before-3.4.17-safe-for-templates-bypass-via-shadow-root-contentCNA: VulnCheck · third-party-advisory
https://github.com/cure53/DOMPurify/security/advisories/GHSA-cg2g-xh64-v4q7ADP: CISA-ADP · exploit
https://github.com/advisories/GHSA-cg2g-xh64-v4q7OSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-cg2g-xh64-v4q7OSV / GitHub Security Advisories · osv

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