{"id":"UBUNTU-CVE-2026-15603","details":"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.","modified":"2026-09-02T16:12:05Z","published":"2026-08-28T16:17:00Z","upstream":["CVE-2026-15603"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-15603"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-15603"},{"type":"REPORT","url":"https://github.com/expressjs/morgan/security/advisories/GHSA-jxfw-x594-9x9m"},{"type":"REPORT","url":"https://cna.openjsf.org/security-advisories.html"}],"affected":[{"package":{"name":"node-morgan","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-morgan?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"node-morgan","binary_version":"1.10.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"}},{"package":{"name":"node-morgan","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-morgan?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0+~1.9.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.0+~1.9.3-1","binary_name":"node-morgan"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15603.json"}},{"package":{"name":"node-morgan","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-morgan?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0+~1.9.3-1","1.10.1+~1.9.10-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-morgan","binary_version":"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"}}],"schema_version":"1.9.0","severity":[{"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"}]}