# CVE-2025-7339: on-headers vulnerable to http response header manipulation

CVE-2025-7339 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-7339, released July 17, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-7339
- Priority: Routine
- CVSS: 3.4 (Low)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 17, 2025
- Weakness: Improper Handling of Unexpected Data Type
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-7339

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | agama-web-ui opensuse-leap 16.0 | 17+612.d8bf69336-160000.11.1 | [OPENSUSE-SU-2026:20919-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20919-1.md) | Jun 8, 2026 |
| Linux | node-on-headers Debian 13.5 (trixie) | 1.0.2-4 | [DEBIAN-CVE-2025-7339](https://patchblox.com/security/data/fix/linux/debian-cve-2025-7339.md) | Jul 17, 2025 |
| Linux | node-on-headers Debian 14 | 1.0.2-4 | [DEBIAN-CVE-2025-7339](https://patchblox.com/security/data/fix/linux/debian-cve-2025-7339.md) | Jul 17, 2025 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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