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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.

PUBLISHED Reserved 2025-07-07 | Published 2025-07-17 | Updated 2025-07-17 | Assigner openjs




LOW: 3.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-241

Product status

Default status
unaffected

Any version before 1.1.0
affected

References

github.com/...eaders/security/advisories/GHSA-76c9-3jph-rj3q

github.com/...ommit/c6e384908c9c6127d18831d16ab0bd96e1231867

cna.openjsf.org/security-advisories.html

github.com/expressjs/morgan/issues/315

github.com/jshttp/on-headers/issues/15

cve.org (CVE-2025-7339)

nvd.nist.gov (CVE-2025-7339)

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