CVE-2026-55246

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Source

https://cve.org/CVERecord?id=CVE-2026-55246

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55246.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55246

Aliases

GHSA-22pc-xxw4-q849

Published

2026-10-15T17:06:59Z

Modified

2026-10-28T11:10:00Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator

Summary

bincookie: Heap buffer overflow via unvalidated `num_pages` when parsing a `.binarycookies` file

Details

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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-122",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55246.json"
}

References

Affected packages

Git / github.com/tatsh/bincookie

Affected ranges

Type

GIT

Repo

https://github.com/tatsh/bincookie

Events

Introduced

Fixed

50e06d41323cdeb0612025d5a03d4d08e5eaf85b

Fixed

bc1433c1ee4d0284750ff85c8437f1b8df91ab3b

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.1.9"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "bc1433c1ee4d0284750ff85c8437f1b8df91ab3b"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v0.1.9",
            "range": [
                {
                    "fixed": "50e06d41323cdeb0612025d5a03d4d08e5eaf85b"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*

v0.0.1

v0.1.0

v0.1.1

v0.1.2

v0.1.3

v0.1.4

v0.1.5

v0.1.6

v0.1.8

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55246.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "186142523620066971272440801035880872374",
            "length": 877
        },
        "id": "CVE-2026-55246-05ec7258",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/tatsh/bincookie/commit/bc1433c1ee4d0284750ff85c8437f1b8df91ab3b",
        "target": {
            "file": "bincookie.h",
            "function": "bincookie_init_file"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "13874585884550053338218074426073001213",
                "241787687622795644945937022900486757986",
                "74747901263247729729104064966102901975",
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                "65641315820708239488826158306521202189",
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                "222004008384625456403329897646642771686",
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                "208955792621045967488302158717564869595",
                "85965797594065175374283935119792417278",
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                "102916787599536830589865359681300249406",
                "304282023808183174677288515107783895207",
                "41133799922695997139976394527402373811"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55246-e565b618",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/tatsh/bincookie/commit/bc1433c1ee4d0284750ff85c8437f1b8df91ab3b",
        "target": {
            "file": "bincookie.h"
        }
    }
]

vanir_signatures_modified

"2026-10-28T11:10:00Z"