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TI-2026-69263 Aliases CVE-2026-107215GHSA-x2q3-8cjh-766f

Excelize crafted OLE files cause memory exhaustion and panic

Priority HIGH 72CWE-789Published · 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-789.

Summary

Excelize versions from 2.3.1 through 2.11.0, a Go library for reading and writing Excel files, are affected. The extractPart function allocates a buffer from a stream size declared in an OLE compound file before validating it (CWE-789). A remote unauthenticated attacker can supply a crafted file with a negative or very large declared size, causing a panic or exhausting process memory. 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 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. No fixed version is available as of this review.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed github.com/xuri/excelize/v2 (Go): 2.11.1-0.20260912113515-5f636f9dcde5

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-osexcelize2.3.1 – 2.11.0—No fix listedCNA
—github.com/xuri/excelize/v2 (Go)2.3.1 to before 2.11.1-0.20260912113515-5f636f9dcde52.11.1-0.20260912113515-5f636f9dcde5Patch availableGHSA-x2q3-8cjh-766f
  • excelize Vendorqax-os Affected 2.3.1 – 2.11.0 Fixed in — No fix listed CNA
  • github.com/xuri/excelize/v2 (Go) Vendor— Affected 2.3.1 to before 2.11.1-0.20260912113515-5f636f9dcde5 Fixed in 2.11.1-0.20260912113515-5f636f9dcde5 Patch available GHSA-x2q3-8cjh-766f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*2.3.1 – 2.11.0Vulnerableqax-os
  • cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:* Versions 2.3.1 – 2.11.0 Vulnerable ·qax-os

Remediation

Upgrade the Go module github.com/xuri/excelize/v2 to 2.11.1-0.20260912113515-5f636f9dcde5, the listed fixed version. The sources list no fixed version for excelize.

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

  • Fix · GHSA-x2q3-8cjh-766f github.com/xuri/excelize/v2 (Go) Fixed in 2.11.1-0.20260912113515-5f636f9dcde5 Advisory →

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-107215
  2. 2026-10-08 Alias added: GHSA-x2q3-8cjh-766f
  3. 2026-10-08 Fix available: Go/github.com/xuri/excelize/[email protected] · GHSA-x2q3-8cjh-766f
  4. 2026-10-08 CVSS score added · GHSA-x2q3-8cjh-766f
  5. 2026-10-08 Weakness changed · GHSA-x2q3-8cjh-766f
  6. 2026-10-08 5 new references · GHSA-x2q3-8cjh-766f
  7. 2026-10-09 Priority changed: MEDIUM → LOW
  8. 2026-10-10 CISA SSVC decision points changed
  9. 2026-10-10 Priority changed: LOW → HIGH

References

Exploit 1

Patch 2

Advisory 1

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-2026-69262 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
  • 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