on-headers vulnerable to http response header manipulation

{
  "id": "ce2f0c398489af220251ba6b6aa27450b1f0833ddb2032abb18d0e0ad9c39d19",
  "url": "https://osv.dev/vulnerability/CVE-2025-7339",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "on-headers vulnerable to http response header manipulation",
    "summary": "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.",
    "evidence": "osv:CVE-2025-7339",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-7339",
      "aliases": [
        "CVE-2025-7339",
        "GHSA-76c9-3jph-rj3q"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/expressjs/morgan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "39950b049e1eca39730cc78d45b137951597fc64"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/jshttp/on-headers",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c6e384908c9c6127d18831d16ab0bd96e1231867"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "c6e384908c9c6127d18831d16ab0bd96e1231867"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.1",
            "1.0.0",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-7339.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.848078101Z",
      "provider": "osv",
      "references": [
        "https://cna.openjsf.org/security-advisories.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/7xxx/CVE-2025-7339.json",
        "https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-7339",
        "https://github.com/expressjs/morgan/issues/315",
        "https://github.com/jshttp/on-headers/issues/15",
        "https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-241"
        ],
        "cna_assigner": "openjs",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/7xxx/CVE-2025-7339.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-7339",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490492,
  "published_at": "2025-07-17T15:47:39.68+00:00"
}