critical
CVE-2026-78207
exceljs-hardened prototype pollution and unbounded XLSX decompression
- Severity
- critical
- Affected product
- exceljs-hardened
- Affected versions
- exceljs-hardened < 5.0.0
- Fixed in
- exceljs-hardened 5.0.0
- Detection basis
- Component version range
- Shipped rule
- exceljs-hardened: exceljs-hardened prototype pollution and unbounded XLSX decompression
- Added to NewScan
- 2026-08-24
- Detected by
- NewScan — free, self-hosted
How NewScan reports it
COMPONENT VERSION RANGE
NewScan fingerprints exceljs-hardened from its response and reports this CVE when the detected version falls inside the affected range below.
Related CVEs covered by this detection
The same shipped rule and upgrade also cover these identifiers:
References
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