CVE-2026-8159
Description
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.
AI Insight
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
multipartynpm | < 4.3.0 | 4.3.0 |
Affected products
2cpe:2.3:a:pillarjs:multiparty:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:pillarjs:multiparty:*:*:*:*:*:node.js:*:*range: <4.3.0
- (no CPE)range: <=4.2.3
Patches
Vulnerability mechanics
References
6- cna.openjsf.org/security-advisories.htmlnvdThird Party AdvisoryWEB
- github.com/advisories/GHSA-65x3-rw7q-gx94ghsaADVISORY
- github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-8159ghsaADVISORY
- github.com/pillarjs/multiparty/releases/tag/v4.3.0ghsaWEB
- owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoSnvdNot ApplicableWEB
News mentions
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