High
node-multiparty — security advisory
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
- Products
- node-multiparty
- Affected versions
- 4.0.0-1, 4.0.0-1ubuntu1, 4.2.1-1, 4.2.1-2, 4.2.2-2, 4.2.2-3, 4.2.3-2, 4.2.3-3, 4.2.3-4build1, 4.2.3-5, 4.3.0+~4.2.1-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-8159
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:20 UTC · Revision 1
Source evidence
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
osv:UBUNTU-CVE-2026-8159
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
node-multiparty
Fixed versions: Not specified
Complete source record
{
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-8159",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-8159",
"summary": "multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.",
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"modified": "2026-10-17T13:01:10.640321509Z",
"provider": "osv",
"upstream": [
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-8159",
"https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94"
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"source_id": "core-osv",
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"published_at": "2026-05-12T10:16:00+00:00"
}