CVE-2026-128344

EUVD-2026-125155
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 50.74%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
exceljs_projectexceljs
𝑥
≤ 4.4.0
CNA
Common Weakness Enumeration
References
https://github.com/exceljs/exceljs
https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/anchor.js#L40-L64
https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L243-L261
https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-cqmf-h7c5-g7xx
https://www.vulncheck.com/advisories/exceljs-through-4.4.0-memory-exhaustion-via-oversized-image-anchor-column
https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-cqmf-h7c5-g7xx