Vulnerability Details CVE-2026-8159
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.5%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-8159
-
cpe:2.3:a:pillarjs:multiparty:0.1.0
-
cpe:2.3:a:pillarjs:multiparty:0.2.0
-
cpe:2.3:a:pillarjs:multiparty:0.3.0
-
cpe:2.3:a:pillarjs:multiparty:0.4.0
-
cpe:2.3:a:pillarjs:multiparty:0.5.0
-
cpe:2.3:a:pillarjs:multiparty:0.6.0
-
cpe:2.3:a:pillarjs:multiparty:0.7.0
-
cpe:2.3:a:pillarjs:multiparty:0.8.0
-
cpe:2.3:a:pillarjs:multiparty:0.9.0
-
cpe:2.3:a:pillarjs:multiparty:0.9.1
-
cpe:2.3:a:pillarjs:multiparty:0.9.10
-
cpe:2.3:a:pillarjs:multiparty:0.9.11
-
cpe:2.3:a:pillarjs:multiparty:0.9.2
-
cpe:2.3:a:pillarjs:multiparty:0.9.3
-
cpe:2.3:a:pillarjs:multiparty:0.9.4
-
cpe:2.3:a:pillarjs:multiparty:0.9.5
-
cpe:2.3:a:pillarjs:multiparty:0.9.6
-
cpe:2.3:a:pillarjs:multiparty:0.9.7
-
cpe:2.3:a:pillarjs:multiparty:0.9.8
-
cpe:2.3:a:pillarjs:multiparty:0.9.9
-
cpe:2.3:a:pillarjs:multiparty:1.0.0
-
cpe:2.3:a:pillarjs:multiparty:1.0.1
-
cpe:2.3:a:pillarjs:multiparty:1.0.10
-
cpe:2.3:a:pillarjs:multiparty:1.0.11
-
cpe:2.3:a:pillarjs:multiparty:1.0.2
-
cpe:2.3:a:pillarjs:multiparty:1.0.3
-
cpe:2.3:a:pillarjs:multiparty:1.0.4
-
cpe:2.3:a:pillarjs:multiparty:1.0.5
-
cpe:2.3:a:pillarjs:multiparty:1.0.6
-
cpe:2.3:a:pillarjs:multiparty:1.0.7
-
cpe:2.3:a:pillarjs:multiparty:1.0.8
-
cpe:2.3:a:pillarjs:multiparty:1.0.9
-
cpe:2.3:a:pillarjs:multiparty:2.0.0
-
cpe:2.3:a:pillarjs:multiparty:2.1.0
-
cpe:2.3:a:pillarjs:multiparty:2.1.1
-
cpe:2.3:a:pillarjs:multiparty:2.1.2
-
cpe:2.3:a:pillarjs:multiparty:2.1.3
-
cpe:2.3:a:pillarjs:multiparty:2.1.4
-
cpe:2.3:a:pillarjs:multiparty:2.1.5
-
cpe:2.3:a:pillarjs:multiparty:2.1.6
-
cpe:2.3:a:pillarjs:multiparty:2.1.7
-
cpe:2.3:a:pillarjs:multiparty:2.1.8
-
cpe:2.3:a:pillarjs:multiparty:2.1.9
-
cpe:2.3:a:pillarjs:multiparty:2.2.0
-
cpe:2.3:a:pillarjs:multiparty:3.0.0
-
cpe:2.3:a:pillarjs:multiparty:3.1.0
-
cpe:2.3:a:pillarjs:multiparty:3.1.1
-
cpe:2.3:a:pillarjs:multiparty:3.1.2
-
cpe:2.3:a:pillarjs:multiparty:3.2.0
-
cpe:2.3:a:pillarjs:multiparty:3.2.1
-
cpe:2.3:a:pillarjs:multiparty:3.2.10
-
cpe:2.3:a:pillarjs:multiparty:3.2.2
-
cpe:2.3:a:pillarjs:multiparty:3.2.3
-
cpe:2.3:a:pillarjs:multiparty:3.2.4
-
cpe:2.3:a:pillarjs:multiparty:3.2.5
-
cpe:2.3:a:pillarjs:multiparty:3.2.6
-
cpe:2.3:a:pillarjs:multiparty:3.2.7
-
cpe:2.3:a:pillarjs:multiparty:3.2.8
-
cpe:2.3:a:pillarjs:multiparty:3.2.9
-
cpe:2.3:a:pillarjs:multiparty:3.3.0
-
cpe:2.3:a:pillarjs:multiparty:3.3.1
-
cpe:2.3:a:pillarjs:multiparty:3.3.2
-
cpe:2.3:a:pillarjs:multiparty:4.0.0
-
cpe:2.3:a:pillarjs:multiparty:4.1.0
-
cpe:2.3:a:pillarjs:multiparty:4.1.1
-
cpe:2.3:a:pillarjs:multiparty:4.1.2
-
cpe:2.3:a:pillarjs:multiparty:4.1.3
-
cpe:2.3:a:pillarjs:multiparty:4.1.4
-
cpe:2.3:a:pillarjs:multiparty:4.2.0
-
cpe:2.3:a:pillarjs:multiparty:4.2.1
-
cpe:2.3:a:pillarjs:multiparty:4.2.2
-
cpe:2.3:a:pillarjs:multiparty:4.2.3