CVE-2025-7339
on-headers is vulnerable to http response header manipulation
3.4
LOW
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2025-7339
To remediate CVE-2025-7339, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 1.1.0 or later
Is CVE-2025-7339 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 0, < 1.1.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.4 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N |