Buffer overflow in Tatsh Bincookie
CVE-2026-55246
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Tatsh Bincookie — versions < 0.1.9
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-55246?
- CVE-2026-55246 is a high-severity vulnerability in Tatsh Bincookie, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-10-15.
- How severe is CVE-2026-55246?
- High severity. CVSS v3 base score is 7.8 out of 10.