CVE-2025-9086

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.

CVSS 3.1 Score

Weakness

• CWE-125

References

• Apple Security Advisory
• NVD Entry
• https://curl.se/docs/CVE-2025-9086.html (Vendor Advisory, Patch)
• https://curl.se/docs/CVE-2025-9086.json (Vendor Advisory)
• https://hackerone.com/reports/3294999 (Exploit, Issue Tracking, Third Party Advisory)
• http://www.openwall.com/lists/oss-security/2025/09/10/1 (Mailing List, Third Party Advisory, Patch)
• https://lists.debian.org/debian-lts-announce/2026/01/msg00002.html (Mailing List, Third Party Advisory)