CVE-2026-15603 Affecting node-morgan package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-DEBIAN11-NODEMORGAN-19427968
  • published29 Aug 2026
  • disclosed28 Aug 2026

Introduced: 28 Aug 2026

NewCVE-2026-15603  (opens in a new tab)

How to fix?

There is no fixed version for Debian:11 node-morgan.

NVD Description

Note: Versions mentioned in the description apply only to the upstream node-morgan package and not the node-morgan package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1