CVEs-PoC/2025/CVE-2025-9086.md

CVE-2025-9086

Description

1. A cookie is set using the secure keyword for https://target2. curl is redirected to or otherwise made to speak with http://target (same hostname, but using clear text HTTP) using the same cookie set3. The same cookie name is set - but with just a slash as path (path='/'). Since this site is not secure, the cookie should just be ignored.4. A bug in the path comparison logic makes curl read outside a heap buffer boundaryThe bug either causes a crash or it potentially makes the comparison come tothe wrong conclusion and lets the clear-text site override the contents of thesecure cookie, contrary to expectations and depending on the memory contentsimmediately following the single-byte allocation that holds the path.The presumed and correct behavior would be to plainly ignore the second set ofthe cookie since it was already set as secure on a secure host so overridingit on an insecure host should not be okay.

POC

Reference

No PoCs from references.

Github

• https://github.com/8-cm/kube-dump
• https://github.com/ARPSyndicate/cve-scores
• https://github.com/fkie-cad/nvd-json-data-feeds