{"id":"CVE-2025-7339","aliases":["GHSA-76c9-3jph-rj3q"],"url":"https://o3.security/vulnerability/CVE-2025-7339","summary":"on-headers vulnerable to http response header manipulation","details":"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":"2025-07-17T15:47:39.680Z","modified":"2026-08-12T03:51:36.855470139Z","cvss":{"score":3.4,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00174,"percentile":0.06873,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"on-headers","fixedVersion":"1.1.0"}],"fix":{"url":"https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867","label":"jshttp/on-headers@c6e3849"},"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/7xxx/CVE-2025-7339.json"},{"type":"ADVISORY","url":"https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-7339"},{"type":"REPORT","url":"https://github.com/expressjs/morgan/issues/315"},{"type":"REPORT","url":"https://github.com/jshttp/on-headers/issues/15"},{"type":"FIX","url":"https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.855470139Z"}}