Heap out-of-bounds read in curl secure cookie path comparison
CVE-2025-9086 is a vulnerability in curl's cookie handling logic triggered during comparison of cookie paths when a secure cookie previously set for an HTTPS origin is later processed in an HTTP context on the same hostname. According to the provided content, the issue occurs when: (1) a cookie is set with the Secure attribute for an HTTPS target, (2) curl is redirected or otherwise made to communicate with the same hostname over cleartext HTTP while reusing the cookie state, and (3) the same cookie name is set again with path="/" from the insecure context. Due to a bug in the path comparison logic, curl performs a read outside a heap buffer boundary involving memory adjacent to a single-byte allocation holding the path. The vulnerable behavior can either crash the process or cause the comparison to produce an incorrect result, allowing an insecure HTTP response to override a previously established secure cookie, contrary to expected cookie security semantics.
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