node-morgan — security advisory

{
  "id": "432d98cdaceedeb21273cc73b368233c67f8bb669d3210843754c2ce8e573d18",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-15603",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-15603",
    "summary": "morgan is an HTTP request logger middleware for Node.js. In versions prior to 1.12.0, the internal helper that escapes log token values did not neutralize the Unicode line separator characters U+0085 (Next Line), U+2028 (Line Separator), and U+2029 (Paragraph Separator). An unauthenticated remote client can place these characters in an attacker-controlled log token, for example a Basic auth username surfaced through the remote-user token, so that Unicode-aware downstream log processing splits a single request log into multiple logical records. This is a log forging issue (CWE-117) and an incomplete-fix follow-up to CVE-2026-5078, which only addressed ASCII control characters. The issue is fixed in morgan 1.12.0, which extends the escaping set to cover these Unicode line separators. Upgrade to morgan 1.12.0 to remediate.",
    "evidence": "osv:UBUNTU-CVE-2026-15603",
    "products": [
      {
        "name": {
          "value": "node-morgan",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.10.0-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-morgan",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.10.0+~1.9.3-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-morgan",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.10.1+~1.9.10-1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-morgan",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.10.0+~1.9.3-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1.10.1+~1.9.10-1",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-15603",
      "aliases": [
        "UBUNTU-CVE-2026-15603"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-morgan",
            "purl": "pkg:deb/ubuntu/node-morgan?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1.10.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-morgan",
                "binary_version": "1.10.0-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-morgan",
            "purl": "pkg:deb/ubuntu/node-morgan?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "1.10.0+~1.9.3-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-morgan",
                "binary_version": "1.10.0+~1.9.3-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-morgan",
            "purl": "pkg:deb/ubuntu/node-morgan?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1.10.1+~1.9.10-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-morgan",
                "binary_version": "1.10.1+~1.9.10-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-morgan",
            "purl": "pkg:deb/ubuntu/node-morgan?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1.10.0+~1.9.3-1",
            "1.10.1+~1.9.10-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-morgan",
                "binary_version": "1.10.1+~1.9.10-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:58:06.587967976Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-15603"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-15603",
        "https://www.cve.org/CVERecord?id=CVE-2026-15603",
        "https://github.com/expressjs/morgan/security/advisories/GHSA-jxfw-x594-9x9m",
        "https://cna.openjsf.org/security-advisories.html"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-15603",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 358121,
  "published_at": "2026-08-28T16:17:00+00:00"
}