CVE-2025-7339
on-headers is a node.js middleware for listening to when a response writes headers. 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()`. Users should upgrade to version 1.1.0 to receive a patch. Uses are strongly 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.
Scoring
- Severity
- LOW
- CVSS base score
- 3.4
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
- EPSS probability
- 0.18%
- CWE
- CWE-241
- Published
- 2025-07-17
- Last modified
- 2026-03-12
Affected products
- jshttp on-headers
Weakness type
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