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CVE-2026-41240VulnerabilityPublished Updated

Red Hat Security Advisory: OpenShift Virtualization v4.15 Images

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-41240· Medium 6.0

Not known to be exploited · CVSS 6.0 Medium : upgrade Red Hat dompurify to 3.4.0 when convenient.

Data as of 30 Oct 2026, 05:59 UTC

CVSS 4.0 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade DOMPurify and dompurify to 3.4.0.

Affected software

ProductAffectedFixed in
cure53DOMPurifyAffected
  • <3.4.0
Fixed in
  • 3.4.0
npmdompurifypkg:npm/dompurifyOther threatsAffected
  • <3.4.0
Fixed in
  • 3.4.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated OpenShift Virtualization v4.15 images that include fixes addressing this vulnerability. Users should ensure all previously released errata are applied before updating to these images. No other mitigations meeting Red Hat's criteria are currently available. Applying the updated images is the recommended remediation.

Description

CVE-2026-41240 is a vulnerability in DOMPurify, a DOM-only cross-site scripting sanitizer used in Red Hat OpenShift Virtualization v4.15 images. The flaw involves inconsistent handling of forbidden tags and attributes when function-based tag additions are used, allowing malicious HTML, MathML, or SVG elements to bypass sanitization and execute arbitrary code in the user's browser. Exploitation requires a specialized configuration with dynamic callback functions and user interaction, limiting the attack surface. Red Hat rates this vulnerability as Moderate due to these constraints. No effective mitigation is currently available that meets Red Hat's criteria, and users are advised to apply the updated OpenShift Virtualization v4.15 images containing fixes for this and other issues.

References

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