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Fencer Vulns
medium 6.5

CVE-2026-107224 json

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

published 2026-10-07 32 d ago modified 2026-11-05 3 d ago also GHSA-fw94-4wwp-w8pw , GO-2026-6679 , EUVD-2026-94555

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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
32 d ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.