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

CVE ID : CVE-2025-9086

Published : Sept. 12, 2025, 6:15 a.m. | 27 minutes ago

Description : 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 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
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.

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…