CVE-2026-15603
- Source
- https://cve.org/CVERecord?id=CVE-2026-15603
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15603.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-15603
- Aliases
-
- GHSA-jxfw-x594-9x9m
- Downstream
- Published
- 2026-08-28T13:41:49.521Z
- Modified
- 2026-09-03T03:47:48.634427106Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- Summary
- morgan vulnerable to Log Forging via unescaped Unicode line separators
- 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15603.json", "cna_assigner": "openjs", "cwe_ids": [ "CWE-117" ] }- References
Affected packages
Git / github.com/expressjs/morgan
Affected ranges
- Type
- GIT
- Repo
- https://github.com/expressjs/morgan
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "cpe": "cpe:2.3:a:morgan_project:morgan:*:*:*:*:*:node.js:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "1.12.0" } ] }