CVE-2026-128344
ExcelJS through 4.4.0 Memory Exhaustion via Oversized Image Anchor Column
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
ExcelJS through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a workbook with an unbounded image anchor column in the drawing part. Attackers can set an anchor column such as 300000000 in xl/drawings/drawing1.xml so reading getImages() anchor positions makes Worksheet.getColumn allocate millions of Column objects and abort with a heap out-of-memory error.
| CWE | CWE-770 |
| Vendor | exceljs |
| Product | exceljs |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
exceljs / exceljs
0 ≤ 4.4.0
References
github.com: https://github.com/exceljs/exceljs github.com: https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-cqmf-h7c5-g7xx github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/anchor.js#L40-L64 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L243-L261 vulncheck.com: https://www.vulncheck.com/advisories/exceljs-through-4.4.0-memory-exhaustion-via-oversized-image-anchor-column
Credits
Matéo Florian Callec