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TI-2026-69275 Aliases CVE-2026-107224GHSA-fw94-4wwp-w8pw

Integer overflow in Excelize crashes on crafted Zip64 workbook

Priority MEDIUM 62CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.

Summary

Excelize, a Go library for reading and writing Microsoft Excel spreadsheets, from 2.1.0 through 2.11.0 mishandles Zip64 entries. A declared uncompressed size of 2^63 or more becomes a negative value (CWE-190), which bypasses unzip limits and reaches make as a negative capacity. An attacker who gets a user to open a crafted workbook can cause a panic during opening. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed github.com/xuri/excelize/v2 (Go): 2.11.1-0.20260805032953-db93f8d89de7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
qax-osexcelize2.1.0 – 2.11.0—No fix listedCNA
—github.com/xuri/excelize/v2 (Go)2.1.0 to before 2.11.1-0.20260805032953-db93f8d89de72.11.1-0.20260805032953-db93f8d89de7Patch availableGHSA-fw94-4wwp-w8pw
  • excelize Vendorqax-os Affected 2.1.0 – 2.11.0 Fixed in — No fix listed CNA
  • github.com/xuri/excelize/v2 (Go) Vendor— Affected 2.1.0 to before 2.11.1-0.20260805032953-db93f8d89de7 Fixed in 2.11.1-0.20260805032953-db93f8d89de7 Patch available GHSA-fw94-4wwp-w8pw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*2.1.0 – 2.11.0Vulnerableqax-os
  • cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:* Versions 2.1.0 – 2.11.0 Vulnerable ·qax-os

Remediation

The Go module github.com/xuri/excelize/v2 is fixed in 2.11.1-0.20260805032953-db93f8d89de7, so upgrade to that version. The sources list no fixed version for Excelize.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · GHSA-fw94-4wwp-w8pw github.com/xuri/excelize/v2 (Go) Fixed in 2.11.1-0.20260805032953-db93f8d89de7 Advisory →

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-107224
  2. 2026-10-07 CISA SSVC decision points changed
  3. 2026-10-07 Alias added: GHSA-fw94-4wwp-w8pw
  4. 2026-10-07 Fix available: Go/github.com/xuri/excelize/[email protected] · GHSA-fw94-4wwp-w8pw
  5. 2026-10-07 CVSS score added · GHSA-fw94-4wwp-w8pw
  6. 2026-10-07 Weakness changed · GHSA-fw94-4wwp-w8pw
  7. 2026-10-07 4 new references · GHSA-fw94-4wwp-w8pw

References

Exploit 1

Patch 2

Other 1

  • TI-2026-42325 Excelize: Streaming GetRows row-bound bypass causes attacker-controlled allocation CVSS 4.0HIGH 8.7
  • TI-2026-69266 Integer overflow in Excelize column parsing causes process panic CVSS 3.1HIGH 7.5
  • TI-2026-69263 Excelize crafted OLE files cause memory exhaustion and panic CVSS 3.1HIGH 7.5
  • TI-2026-69262 Unrecoverable panics in Excelize Decrypt on malformed OLE workbooks CVSS 3.1HIGH 7.5
  • TI-2026-69260 Unbounded row number in Excelize lets crafted spreadsheets hang reads CVSS 3.1HIGH 7.5
  • TI-2026-38996 Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS) CVSS 3.1HIGH 7.5
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences