CVE-2026-118659 Happy DOM - Server Side Request Forgery

Happy DOM server-renderer < 21.0.2 contains a server-side request forgery caused by resolving attacker-controlled :path values without origin validation in ServerRendererServer, letting attackers make arbitrary HTTP/HTTPS requests, exploit requires unauthenticated HTTP/2 access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Server Side Request Forgery, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-918

Vendor fix

Update to version 21.0.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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