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.
History

Mon, 19 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Tatsh
Tatsh bincookie
Vendors & Products Tatsh
Tatsh bincookie

Thu, 15 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Description 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.
Title bincookie: Heap buffer overflow via unvalidated `num_pages` when parsing a `.binarycookies` file
Weaknesses CWE-122
CWE-787
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-15T17:06:59.783Z

Updated: 2026-10-15T18:27:40.897Z

Reserved: 2026-06-16T16:44:00.624Z

Link: CVE-2026-55246

cve-icon Vulnrichment

Updated: 2026-10-15T18:27:35.089Z

cve-icon NVD

Status : Deferred

Published: 2026-10-15T18:17:27.317

Modified: 2026-10-16T20:04:29.760

Link: CVE-2026-55246

cve-icon Redhat

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