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Fencer Intel
medium 6.5

CVE-2026-107224 json

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

published last mo. modified 4d ago also EUVD-2026-94555 , GHSA-fw94-4wwp-w8pw , GO-2026-6679

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/xuri/excelize/v2 2.11.1-0.20260805032953-db93f8d89de7

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/xuri/excelize/v2
>=2.1.0, <2.11.1-0.20260805032953-db93f8d89de7
<2.11.1-0.20260805032953-db93f8d89de7
2.11.1-0.20260805032953-db93f8d89de7
go github.com/360EntSecGroup-Skylar/excelize/v2
>=2.1.0
 no fix listed

Affected products

  • qax-os excelize

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • CWE-681 Incorrect Conversion between Numeric Types

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.