CVE-2026-107215: high-severity vulnerability in qax-os excelize
Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS
Published
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5
exploitation probability
—
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
qax-os · excelizeRelated CVEs — qax-os excelize
In the same product, most dangerous first.
CVE-2026-59162MEDIUMExcelize: Negative shared-string index causes panic in GetCellValue and GetRowsEPSS 0.7%CVE-2026-59161HIGHExcelize: Streaming GetRows row-bound bypass causes attacker-controlled allocationEPSS 0.7%CVE-2026-54063HIGHExcelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)EPSS 0.6%CVE-2026-107225MEDIUMExcelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xmlEPSS —CVE-2026-107224MEDIUMExcelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReaderEPSS —CVE-2026-107223HIGHExcelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the processEPSS —