Bug 2525625 (CVE-2026-15603) - CVE-2026-15603 morgan: morgan: Log Forging via unescaped Unicode line separators
Summary: CVE-2026-15603 morgan: morgan: Log Forging via unescaped Unicode line separators
Keywords:
Status: NEW
Alias: CVE-2026-15603
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2528005
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-28 15:32 UTC by OSIDB Bzimport
Modified: 2026-09-03 12:48 UTC (History)
13 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-28 15:32:42 UTC
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.


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