CVE-2026-120213 @fastify/http-proxy - Path Traversal

@fastify/http-proxy 9.0.0 through 11.6.5 contains a path traversal caused by improper URL-decoding of route parameters in rewritePrefix, letting unauthenticated remote attackers bypass path restrictions and access unintended upstream locations.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Path Traversal
Impact
Path Traversal, Server Side Request Forgery, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2 November 2026
Updated
3 November 2026
Weakness
CWE-22

Vendor fix

Upgrade to version 11.6.6 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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