CVE-2026-55246

CVE-2026-55246 · bincookie: Heap buffer overflow via unvalidated `num_pages` when parsing a `.binarycookies` file

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

bincookie is a header-only binarycookies parser. Prior to 0.1.9, bincookie_init_file() in bincookie.h allocates a buffer using the actual .binarycookies file length but trusts the file-controlled num_pages field as the loop bound for byte-swapping page_sizes entries. A crafted file can make the loop read and write beyond the heap allocation, and related unvalidated page sizes and cookie_offsets can drive additional out-of-bounds accesses in page and cookie iteration. Applications that parse an attacker-supplied binarycookies file may crash or suffer heap corruption that can potentially enable code execution. This issue is fixed in version 0.1.9.

CVSS 7.8 · High · EPSS 0.2%

Published

2026-10-15T17:06:59.783Z

Updated

2026-10-15T18:27:40.897Z

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