{"id":"CVE-2026-107215","state":"PUBLISHED","title":"Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS","description":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. No fixed version is available as of this review.","publishedAt":"2026-10-07T17:48:03.233Z","updatedAt":"2026-10-10T02:38:31.276Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["qax-os excelize"],"affected":[{"vendor":"qax-os","product":"excelize","versions":[{"version":">= 2.3.1, <= 2.11.0","status":"affected"}]}],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f","https://github.com/qax-os/excelize/pull/2396","https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/107xxx/CVE-2026-107215.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-107215","state":"PUBLISHED","datePublished":"2026-10-07T17:48:03.233Z","dateUpdated":"2026-10-10T02:38:31.276Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-07T14:34:14.815Z"},"containers":{"cna":{"title":"Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS","descriptions":[{"lang":"en","value":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. No fixed version is available as of this review."}],"affected":[{"vendor":"qax-os","product":"excelize","versions":[{"version":">= 2.3.1, <= 2.11.0","status":"affected"}]}],"references":[{"url":"https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f","name":"https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/qax-os/excelize/pull/2396","name":"https://github.com/qax-os/excelize/pull/2396","tags":["x_refsource_MISC"]},{"url":"https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694","name":"https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-07T17:48:03.233Z"},"source":{"advisory":"GHSA-x2q3-8cjh-766f","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-10T02:38:08.709822Z","id":"CVE-2026-107215","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-10T02:38:31.276Z"}}]}}}