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.

Score

CVSS 3.1 3.4 Low

Status

Deferred - ce714d77-add3-4f53-aff5-83d477b104bb

Published

2025-07-17

Last modified

2025-07-17

Weaknesses

CWE-241

Affected products

• On-headers (Jshttp)

References

• 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