CVE-2026-8159

HIGH EPSS 25.3%
Published May 12, 20261mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published May 12, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
25.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-1333

Affected Products 1

VendorProductVersionRange
pillarjsmultiparty* <4.3.0

References 3

  • cna.openjsf.org https://cna.openjsf.org/security-advisories.html
    Third Party Advisory
  • github.com https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94
    MitigationVendor Advisory
  • owasp.org https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
    Not Applicable

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.