GitHub Advisoryadvisory · npm
GHSA-76c9-3jph-rj3q on-headers is vulnerable to http response header manipulation
LOW
Official page ↗
- Aliases
- CVE-2025-7339
- Ecosystem
- npm
- Packages
- on-headers
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-241
- Reviewed
- 2025-07-17
Affected packages
• npm on-headers: < 1.1.0 → fixed in 1.1.0
Description
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.
Related
Alias · CVE (1)
- CVE-2025-7339 on-headers is a node.js middleware for listening to when a response writes headers. vulnerability
Weakness · CWE (1)
- CWE-241 Improper Handling of Unexpected Data Type weakness
References
- https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q web
- https://nvd.nist.gov/vuln/detail/CVE-2025-7339 advisory
- https://github.com/expressjs/morgan/issues/315 web
- https://github.com/jshttp/on-headers/issues/15 web
- https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867 web
- https://cna.openjsf.org/security-advisories.html web
- https://github.com/jshttp/on-headers package