CVE Explorer

CVE-2026-8161

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 field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affecte

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9added71dafc548266febc53d7013159dbc8e56d0a45633ddbc700ec817a7159

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/problemTypes/1/descriptions/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:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /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:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions

{"url":"https://cna.openjsf.org/security-advisories.html"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /containers/cna/references/1

{"url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:090626e048cf2d14163ef9b21ed86faf3ec2e0eef103ad9cbe308e1b9049ad8e · sha256:deb53d207c5b47be… · /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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