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TI-2026-38996 Aliases CVE-2026-54063GHSA-h69g-9hx6-f3v4

Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)

Priority HIGH 72CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
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-770.

Summary

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, the checkSheet() function in github.com/xuri/excelize/v2 uses an attacker-controlled <row r="N"> XML attribute value directly as the length argument to make([]xlsxRow, row) without validating it against the Excel row limit (TotalRows = 1,048,576). A specially crafted XLSX file can trigger two denial-of-service variants: (A) an out-of-memory process kill when r=2147483647 forces a ~16 GB allocation attempt, and (B) a runtime panic via out-of-bounds slice indexing when r=-1. Any service that opens attacker-supplied XLSX files and calls GetCellValue is affected. No authentication is required. This issue is fixed in version 2.11.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00607 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed excelize (qax-os): 2.11.0github.com/xuri/excelize/v2 (Go): 2.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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-osexcelizebefore 2.11.02.11.0Patch availableCNA
—github.com/xuri/excelize/v2 (Go)before 2.11.02.11.0Patch availableGHSA-h69g-9hx6-f3v4
  • excelize Vendorqax-os Affected before 2.11.0 Fixed in 2.11.0 Patch available CNA
  • github.com/xuri/excelize/v2 (Go) Vendor— Affected before 2.11.0 Fixed in 2.11.0 Patch available GHSA-h69g-9hx6-f3v4

CPE configurations NVD · 1

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

Remediation

  • Fix · CNA excelize (qax-os) Fixed in 2.11.0
  • Fix · GHSA-h69g-9hx6-f3v4 github.com/xuri/excelize/v2 (Go) Fixed in 2.11.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54063
  2. 2026-10-03 Alias added: GHSA-h69g-9hx6-f3v4

References

Exploit 1

Advisory 1

Other 2

  • 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-2026-42326 Excelize: Negative shared-string index causes panic in GetCellValue and GetRows CVSS 4.0MEDIUM 6.9
See all 17 →

Sources

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