on-headers is vulnerable to http response header manipulation
Impact
A bug in on-headers versions < 1.1.0 may result in response headers being inadvertently modified when an array is passed to response.writeHead()
Patches
Users should upgrade to 1.1.0
Workarounds
Uses are encouraged to upgrade to 1.1.0, but this issue can be worked around by passing an object to response.writeHead() rather than an array.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | on-headers | < 1.1.0 | 1.1.0 |
References
- https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q
- https://nvd.nist.gov/vuln/detail/CVE-2025-7339
- https://github.com/expressjs/morgan/issues/315
- https://github.com/jshttp/on-headers/issues/15
- https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867
- https://cna.openjsf.org/security-advisories.html
- https://github.com/jshttp/on-headers
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-241- Platform
- npm
- Package
on-headers- Disclosed
- 17.07.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-76c9-3jph-rj3q - CC BY 4.0
Vulnerability history: on-headers
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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