multiparty vulnerable to ReDoS via filename parsing_CVE-2026-8159

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

[email protected] 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 [email protected] or higher.

Basic Information

ID CVE-2026-8159

Source openjs

Published May 12, 2026 at 08:35

Affected Product

Vendor multiparty

Product multiparty

Affected Versions multiparty multiparty 0

CWE Classification

CWE-1333

References

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    "lastseen": "",
    "description": "[email protected] 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 [email protected] or higher.",
    "published": "2026-05-12T08:35:39.564Z",
    "modified": "2026-05-12T08:35:39.564Z",
    "type": "cve",
    "title": "multiparty vulnerable to ReDoS via filename parsing",
    "source": "openjs",
    "references": "https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94\nhttps://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS\nhttps://cna.openjsf.org/security-advisories.html",
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