CVE-2026-15603

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.

• CWE-117

• https://cna.openjsf.org/security-advisories.htmlThird Party Advisory
• https://github.com/expressjs/morgan/security/advisories/GHSA-jxfw-x594-9x9mVendor Advisory

Published

Aug 28, 2026

Last Modified

Aug 31, 2026

Status

Analyzed

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