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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: node-morgan: CVE-2026-87859
Message-ID: <178922628954.2917236.11606001489885923328.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Sat, 12 Sep 2026 17:18:09 +0200
Delivered-To: submit@bugs.debian.org

Source: node-morgan
Version: 1.12.0+~1.9.10-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for node-morgan.

CVE-2026-87859[0]:
| morgan is an HTTP request logger middleware for Node.js. In versions
| before 1.12.1, its escapeLogField() function does not escape the
| double quote character, which delimits the quoted fields of the
| Apache combined log format that morgan emits. An unauthenticated
| remote attacker who controls a value written to a quoted field, such
| as the User-Agent or Referer header, can include a double quote to
| close that field early, so a log consumer that parses the log by
| field position reads attacker-supplied text as the following field.
| In the built-in formats this makes the recorded value differ from
| the value that was sent, and in custom formats that quote an
| attacker-controlled token before a server-controlled one it can
| forge values such as the response status. No newline is injected, so
| record separation stays intact. The issue is fixed in morgan 1.12.1,
| which escapes the double quote. Users should upgrade to morgan
| 1.12.1 or later.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-87859
    https://www.cve.org/CVERecord?id=CVE-2026-87859
[1] https://github.com/expressjs/morgan/security/advisories/GHSA-9f6g-j8ch-79g4
[2] https://github.com/expressjs/morgan/commit/4b695edf967ce179cdf4009fe8cddd184b7511ee

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]