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CVE-2026-128342: exceljs: ExcelJS through 4.4.0 contains a denial of service vulnerability that allows attackers to block the event loop by…

🗓️ 13 Nov 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 3 Views

DoS in ExcelJS via unbounded sheetId in xl/workbook.xml blocks the event loop.

Related
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-128342
13 Nov 202610:36
–circl
cve
CVE
CVE-2026-128342
13 Nov 202609:33
–cve
cvelist
Cvelist
CVE-2026-128342 ExcelJS through 4.4.0 Denial of Service via Oversized Worksheet sheetId
13 Nov 202609:33
–cvelist
euvd
EUVD
EUVD-2026-125157
13 Nov 202609:33
–euvd
mend
Mend
CVE-2026-128342
13 Nov 202609:33
–mend
nvd
NVD
CVE-2026-128342
13 Nov 202610:18
–nvd
ptsecurity
Positive Technologies
PT-2026-146556
13 Nov 202600:00
–ptsecurity

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13 Nov 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.17.5
CVSS 48.7
EPSS0.00542
3