CVE-2026-44974
@hapi/content header parser has a parameter smuggling issue that allows upload-filter bypass via duplicate parameters
Description
### Impact The two parsers resolved duplicates inconsistently and silently: - `Content.disposition()` retained the last occurrence of each parameter. - `Content.type()` retained the first occurrence of charset and boundary. Either behavior creates a parameter-smuggling primitive when another component in the request-processing chain (a WAF, reverse proxy, security filter, or alternate parser) resolves duplicates the opposite way. The primary attack vector is upload filename allowlist bypass: `Content-Disposition: form-data; name="file"; filename="safe.txt"; filename="shell.php"` ### Patches The issue has been patched in 6.0.2. ### Workarounds Pre or post validate headers looking for duplicates. ### Resources - [RFC 6266 §4.1 — Content-Disposition syntax](https://www.rfc-editor.org/rfc/rfc6266#section-4.1) - [RFC 7231 §3.1.1.1 — Content-Type syntax](https://www.rfc-editor.org/rfc/rfc7231#section-3.1.1.1) - [RFC 7230 §3.2.6 — token character set](https://www.rfc-editor.org/rfc/rfc7230#section-3.2.6)
How to fix CVE-2026-44974
To remediate CVE-2026-44974, upgrade the affected package to a fixed version below.
- —upgrade to 6.0.2 or later
Is CVE-2026-44974 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-44974.
Affected packages (1)
- from 0, < 6.0.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:H/SA:N |