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CVE-2025-9086 is a vulnerability in curl's cookie handling logic triggered when a secure cookie previously set over HTTPS is later processed alongside a cookie of the same name received over clear-text HTTP on the same hostname. When the insecure cookie is set with a root path value, a flaw in the cookie path comparison logic can cause curl to read past the end of a heap buffer during path evaluation. The issue arises while determining whether the insecure cookie should override the existing secure cookie. Instead of reliably rejecting the insecure overwrite attempt, the out-of-bounds read can either crash the process or influence the comparison result based on adjacent heap memory contents. In the latter case, curl may incorrectly allow an HTTP-originated cookie to replace a secure cookie, violating expected secure-cookie isolation semantics.
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27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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