CVE-2025-9086

CVE-2025-9086 · Out of bounds read for cookie path

This page contains facts from public vulnerability sources. Check the original advisory before updating.

1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name is set - but with only a slash as path (`path="/"`). Since this site is not secure, the cookie *should* be ignored. 4. A bug in the path comparison logic makes curl read outside a heap buffer boundary The bug either causes a crash or it potentially makes the comparison come to the wrong conclusion and lets the clear-text site override the contents of the secure cookie, contrary to expectations and depending on the memory contents immediately following the single-byte allocation that holds the path. The presumed and correct behavior would be to plainly ignore the second set of the cookie since it was already set as secure on a secure host so overriding it on an insecure host should not be okay.

CVSS 7.5 · High · EPSS 1.5% · Fix available

Published

2025-09-12T05:10:03.815Z

Updated

2026-09-15T06:02:35.281Z

Stack: system

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