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CVE-2026-8162

multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a Content-Disposition header whose filename* parameter contains a malformed percent-encoding, the parser invokes decodeURI on the value without try/catch. The resulting URIError propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:842153e5b7d13d69d6e3d2218d70c3c311bed43a8668825d11e977bfada067e3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/multiparty","product":"multiparty","vendor":"multiparty","versions":[{"lessThanOrEqual":"4.2.3","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"4.3.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:694d5530305de9bd042ab627c4f514b29354320d5c8a9b04c87db8515a813f16 · sha256:ee51ba69776b07a5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:694d5530305de9bd042ab627c4f514b29354320d5c8a9b04c87db8515a813f16 · sha256:ee51ba69776b07a5… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:694d5530305de9bd042ab627c4f514b29354320d5c8a9b04c87db8515a813f16 · sha256:ee51ba69776b07a5… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:694d5530305de9bd042ab627c4f514b29354320d5c8a9b04c87db8515a813f16 · sha256:ee51ba69776b07a5… · /containers/cna/references/1
{"url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-xh3c-6gcq-g4rv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:694d5530305de9bd042ab627c4f514b29354320d5c8a9b04c87db8515a813f16 · sha256:ee51ba69776b07a5… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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