{"id":"CVE-2026-55246","state":"PUBLISHED","title":"bincookie: Heap buffer overflow via unvalidated `num_pages` when parsing a `.binarycookies` file","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.","publishedAt":"2026-10-15T17:06:59.783Z","updatedAt":"2026-10-15T18:27:40.897Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["Tatsh bincookie"],"affected":[{"vendor":"Tatsh","product":"bincookie","versions":[{"version":"< 0.1.9","status":"affected"}]}],"references":["https://github.com/Tatsh/bincookie/security/advisories/GHSA-22pc-xxw4-q849","https://github.com/Tatsh/bincookie/commit/bc1433c1ee4d0284750ff85c8437f1b8df91ab3b","https://github.com/Tatsh/bincookie/releases/tag/v0.1.9"],"weaknesses":["CWE-122","CWE-787"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55246.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55246","state":"PUBLISHED","datePublished":"2026-10-15T17:06:59.783Z","dateUpdated":"2026-10-15T18:27:40.897Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T16:44:00.624Z"},"containers":{"cna":{"title":"bincookie: Heap buffer overflow via unvalidated `num_pages` when parsing a `.binarycookies` file","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Tatsh","product":"bincookie","versions":[{"version":"< 0.1.9","status":"affected"}]}],"references":[{"url":"https://github.com/Tatsh/bincookie/security/advisories/GHSA-22pc-xxw4-q849","name":"https://github.com/Tatsh/bincookie/security/advisories/GHSA-22pc-xxw4-q849","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Tatsh/bincookie/commit/bc1433c1ee4d0284750ff85c8437f1b8df91ab3b","name":"https://github.com/Tatsh/bincookie/commit/bc1433c1ee4d0284750ff85c8437f1b8df91ab3b","tags":["x_refsource_MISC"]},{"url":"https://github.com/Tatsh/bincookie/releases/tag/v0.1.9","name":"https://github.com/Tatsh/bincookie/releases/tag/v0.1.9","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787: Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-15T17:06:59.783Z"},"source":{"advisory":"GHSA-22pc-xxw4-q849","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Tatsh/bincookie/security/advisories/GHSA-22pc-xxw4-q849","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T18:27:22.750510Z","id":"CVE-2026-55246","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T18:27:40.897Z"}}]}}}