Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReader

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107224
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-07 19:17:35 UTC
Updated2026-10-07 20:17:11 UTC
DescriptionExcelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, a Zip64 uncompressed size with the high bit set is converted from uint64 to a negative int64 before signed size-limit checks and allocation. ReadZipReader obtains UncompressedSize64 through FileInfo.Size and passes the wrapped negative value to readFile. When a crafted Zip64 entry declares an uncompressed size from 2^63 through 2^64-1 and the workbook is opened, the negative size bypasses unzip limits and reaches make as a negative capacity, allowing an attacker to panic during workbook opening. No fixed version is available as of this review.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem Types: CWE-190 | CWE-681 | CWE-190 CWE-190: Integer Overflow or Wraparound | CWE-681 CWE-681: Incorrect Conversion between Numeric Types

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Qax-os Excelize affected >= 2.1.0, <= 2.11.0 Not specified

References

ReferenceSourceLinkTags
github.com/qax-os/excelize/commit/db93f8d89de71589069a54d1b998af02e3c5f7cd [email protected] github.com
github.com/qax-os/excelize/pull/2369 [email protected] github.com
github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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