CVE-2026-107215

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.

• CWE-789

• https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694
• https://github.com/qax-os/excelize/pull/2396
• https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f

Published

Oct 7, 2026

Last Modified

Oct 7, 2026

Status

Received

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