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.

Database specific

{
    "cwe_ids": [
        "CWE-1333"
    ],
    "cna_assigner": "openjs",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8159.json"
}

References

Affected packages

Git / github.com/pillarjs/multiparty

Affected ranges

Type

GIT

Repo

https://github.com/pillarjs/multiparty

Events

Introduced

Fixed

f7963dbfb8c66764790790cf79eb0992c0e45ff0

Database specific

{
    "cpe": "cpe:2.3:a:pillarjs:multiparty:*:*:*:*:*:node.js:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "4.2.3"
        },
        {
            "fixed": "4.3.0"
        }
    ]
}

Affected versions

2.*

2.0.0

2.1.0

2.1.1

2.1.2

2.1.3

2.1.4

2.1.5

2.1.6

2.1.7

2.1.8

2.1.9

2.2.0

3.*

3.0.0

3.1.0

3.1.1

3.1.2

3.2.0

3.2.1

3.2.2

3.2.3

3.2.4

3.2.5

3.2.6

3.2.7

3.2.8

3.2.9

3.3.0

3.3.1

3.3.2

4.*

4.0.0

4.1.0

4.1.1

4.1.2

4.1.3

4.1.4

4.2.0

4.2.1

4.2.2

4.2.3

v0.*

v0.1.0

v0.2.0

v0.3.0

v0.4.0

v0.5.0

v0.6.0

v0.7.0

v0.8.0

v0.9.0

v0.9.1

v0.9.10

v0.9.11

v0.9.2

v0.9.3

v0.9.4

v0.9.5

v0.9.6

v0.9.7

v0.9.8

v0.9.9

v1.*

v1.0.0

v1.0.1

v1.0.10

v1.0.11

v1.0.2

v1.0.3

v1.0.4

v1.0.5

v1.0.6

v1.0.7

v1.0.8

v1.0.9

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-8159.json"