{"id":"CVE-2026-107215","title":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets","summary":"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 c…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-789"],"vendor":"qax-os","product":"excelize","affected":["excelize >= 2.3.1, <= 2.11.0"],"published":"2026-10-07","updated":"2026-10-07","sourceUpdated":"2026-10-07T18:17:19.213","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107215","references":[{"url":"https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694","label":"security-advisories@github.com"},{"url":"https://github.com/qax-os/excelize/pull/2396","label":"security-advisories@github.com"},{"url":"https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-07T18:42:20.891Z","slug":"CVE-2026-107215","body":"## Overview\n\nExcelize 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}