High
exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression
Type: advisorySources: OSV
exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-78206
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:02 UTC · Revision 1
Source evidence
exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression
core-osv · Original sourcePublished 24 Aug 2026, 00:30 UTC
exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.
osv:CVE-2026-78206
Complete source record
{
"id": "d1105db2493ee7b640f9ad78401c9d55bdc07f474107c8ff1b43301b69c7ae5e",
"url": "https://osv.dev/vulnerability/CVE-2026-78206",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression",
"summary": "exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.",
"evidence": "osv:CVE-2026-78206",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-78206",
"aliases": [
"CVE-2026-78206",
"GHSA-7cvf-3r55-r39q"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/exceljs/exceljs",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "ac96f9a61e9799c7776bd940f05c4a51d7200209"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "4.4.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "4.4.0"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"v4.4.0",
"v4.3.0",
"v4.2.1",
"v4.2.0",
"v4.1.1",
"v4.1.0",
"v4.0.1",
"v4.0.0",
"v3.10.0",
"v3.9.0",
"v3.8.2",
"v3.8.1",
"v3.8.0",
"v3.7.0",
"v3.5.0",
"v3.4.0",
"v3.3.1",
"v3.3.0",
"v3.2.0",
"v3.1.0",
"v3.0.0",
"v2.0.1",
"v2.0.0",
"v1.15.0",
"v1.14.0",
"v1.13.0",
"v1.12.2",
"v1.12.1",
"v1.12.0",
"v1.11.0",
"v1.10.0",
"v1.9.1",
"v1.9.0",
"v1.8.0",
"v1.7.0",
"v1.6.3",
"v1.6.2",
"v1.6.1",
"v1.6.0",
"v1.5.1",
"v1.5.0",
"v1.4.13",
"v1.4.12",
"v1.4.11",
"v1.4.10",
"v1.4.9",
"v1.4.8",
"v1.4.7",
"v1.4.6",
"v1.4.5",
"v1.4.4",
"v1.4.3",
"v1.3.0",
"v1.4.2",
"v1.4.1",
"v1.4.0",
"v1.2.1",
"v1.2.0",
"v1.1.3",
"v1.1.2",
"v1.1.1",
"v1.1.0",
"v1.0.2",
"v1.0.1",
"v1.0.0",
"v0.9.1",
"v0.9.0",
"v0.8.5",
"v0.8.4",
"v0.8.3",
"v0.8.2",
"v0.8.1",
"v0.8.0",
"v0.7.1",
"v0.7.0",
"v0.6.2",
"v0.5.1",
"v0.6.0",
"v0.5.0",
"v0.4.14",
"v0.4.13",
"v0.4.12",
"v0.4.11",
"v0.4.10",
"v0.4.9",
"v0.2.36",
"0.2.36",
"v0.2.35",
"0.2.35",
"v0.2.34",
"0.2.34",
"v0.2.33",
"0.2.33",
"v0.2.31",
"0.2.31",
"v0.2.30",
"0.2.30",
"v0.2.29",
"0.2.29",
"v0.2.28",
"0.2.28",
"v0.2.27",
"0.2.27",
"v0.2.26",
"0.2.26",
"v0.2.24",
"0.2.24",
"v0.2.23",
"0.2.23",
"v0.2.22",
"0.2.22",
"v0.2.21",
"0.2.21",
"v0.2.20",
"0.2.20",
"v0.2.19",
"0.2.19",
"v0.2.18",
"0.2.18",
"v0.2.17",
"0.2.17",
"v0.2.16",
"0.2.16",
"v0.2.15",
"0.2.15",
"v0.2.12",
"0.2.12",
"v0.2.11",
"0.2.11",
"v0.2.10",
"0.2.10",
"v0.2.8",
"0.2.8",
"v0.2.3",
"0.2.3",
"v0.2.2",
"v0.2.1",
"0.2.2",
"0.2.1",
"v0.2.0",
"0.2.0",
"v0.1.11",
"0.1.11",
"v0.1.10",
"0.1.10",
"v0.1.9",
"0.1.9",
"v0.1.8",
"0.1.8",
"v0.1.7",
"0.1.7",
"v0.1.6",
"0.1.6",
"v0.1.5",
"0.1.5",
"v0.1.4",
"0.1.4",
"v0.1.3",
"0.1.3",
"v0.1.2",
"0.1.2",
"v0.1.1",
"0.1.1",
"v0.1.0",
"0.1.0",
"v0.0.9",
"0.0.9",
"v0.0.8",
"0.0.8",
"v0.0.7",
"0.0.7",
"v0.0.6",
"0.0.6",
"v0.0.5",
"0.0.5",
"v0.0.4",
"0.0.4",
"v0.0.3",
"0.0.3",
"v0.0.2",
"0.0.2",
"v0.0.1",
"0.0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-78206.json"
}
}
],
"modified": "2026-10-28T02:30:30.636572392Z",
"provider": "osv",
"references": [
"https://www.npmjs.com/package/exceljs",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78206.json",
"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q",
"https://nvd.nist.gov/vuln/detail/CVE-2026-78206",
"https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression",
"https://github.com/exceljs/exceljs",
"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281"
],
"provider_metadata": {
"cwe_ids": [
"CWE-409"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78206.json"
}
},
"related_cves": [
{
"value": "CVE-2026-78206",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497659,
"published_at": "2026-08-24T00:30:46.462+00:00"
}