CVE-2026-107224Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReader
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Excelize 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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-190, CWE-681
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
qax-os excelize qax_os:excelize (from the name) | from 2.1.0, <= 2.11.0 | CNA record |
excelize excelize excelize:excelize | from 2.1.0 through 2.11.0 | NVD |
References
- https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pwx-refsource-confirm, exploit, vendor-advisory
- https://github.com/qax-os/excelize/pull/2369x-refsource-misc, issue-tracking, patch
- https://github.com/qax-os/excelize/commit/db93f8d89de71589069a54d1b998af02e3c5f7cdx-refsource-misc, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.