CVE-2026-15603

The record

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.

Affected packages

Related vulnerabilities

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• CVE-2026-87859 morgan is an HTTP request logger middleware for Node.js. CWE-117
• CVE-2026-14350 IBM Cloud Pak for Data System 11.3.0.2 through Interim Fix 001 could allow an… CWE-117
• CVE-2026-9736 IBM Netezza Software 11.3.0.3 through Interim Fix 002 could allow an unauthorized user to… CWE-117
• CVE-2026-81694 openssl-encrypt (pip package, versions <= 1.4.8) fails to sanitize filenames read from… CWE-117
• CVE-2026-81695 openssl_encrypt versions before 1.4.9 fail to escape attacker-controlled key_id values… CWE-117
• CVE-2026-81696 openssl_encrypt versions before 1.4.9 fail to sanitize terminal control characters in… CWE-117
• CVE-2026-54511 LogTape is an unobtrusive logging library. CWE-117