low3.4
CVE-2025-7339
on-headers is vulnerable to http response header manipulation
Impact
### 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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | on-headers | < 1.1.0 | 1.1.0 |
Affected products
| Product | Affected versions |
|---|---|
| On-Headers Versions ` | before 1.1.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/morgan/issues/315
- https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867
- https://github.com/jshttp/on-headers/issues/15
- https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q
- https://github.com/advisories/GHSA-76c9-3jph-rj3q
- https://nvd.nist.gov/vuln/detail/CVE-2025-7339