CVE-2026-65898: DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitiz

This week

HIGH 7.2REMOTEUPGRADE

CVE-2026-65898 is a high-severity flaw (CVSS 7.2) affecting dompurify. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitizeAttribute hook, allowing the hook to permanently mutate the shared allowlist. Attackers can register a hook that conditionally allows dangerous attributes like onerror for trusted elements, then submit untrusted content that inherits the polluted allowlist and executes event handlers as stored XSS.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-07-23
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: cure53

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-23 14:18 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

cure53 dompurify UPGRADE

Affected: < 3.4.11

Fixed in: 3.4.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dompurify || rpm -q dompurify || dompurify --version

2. UPGRADE to 3.4.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dompurify

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dompurify

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

npm · dompurify · FIXED · 3.4.11 · vulnerable: <= 3.4.10 · source

npm install dompurify@">=3.4.11" npm ls dompurify

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source

sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3

Debian 12 · node-dompurify · NO FIX YET

Debian 13 · node-dompurify · NO FIX YET

RHEL 10 · ceph · DEFERRED

RHEL 10 · cockpit-image-builder · DEFERRED

RHEL 10 · grafana · DEFERRED

RHEL 10 · grafana-pcp · DEFERRED

RHEL 8 · grafana · DEFERRED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-65898?

dompurify: upgrade to 3.4.11. Exact commands for each OS are on this page.

Is CVE-2026-65898 being exploited?

CVE-2026-65898 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-65898 affect?

CVE-2026-65898 affects dompurify. Severity is high (CVSS 7.2). DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitizeAttribute hook, allowing the hook to permanently mutate the shared allowlist. Attackers can register a hook that conditionally al

How urgent is CVE-2026-65898?

Priority 38/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-65899 MEDIUM 6.1 UPGRADE DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so
CVE-2026-65902 MEDIUM 6.1 UPGRADE DOMPurify before 3.4.7 (affected versions <= 3.4.5) passes direct references to the module-level DEFAULT_ALLOW
CVE-2026-65911 MEDIUM 6.1 UPGRADE In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() pers
CVE-2026-65900 MEDIUM 6.1 UPGRADE DOMPurify versions >=3.0.0 and before 3.4.8, when configured with SAFE_FOR_TEMPLATES together with a DOM outpu
CVE-2026-65903 MEDIUM 6.1 UPGRADE DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows f

References

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