fix(deps): update dependency morgan to v1.12.0 [security] - #245

Details

Impact

Morgan's :remote-user token extracts the Basic auth username from the Authorization header and writes it to the log stream without neutralizing control characters. An attacker can send a crafted Authorization: Basic header containing CR/LF characters to inject forged log lines, corrupting the one-request-per-line structure of access logs.

The built-in combined, common, default, and short formats are affected, as well as any custom format that includes :remote-user.

Patches

Users should upgrade to version 1.11.0.

Workarounds

Use a custom format string that does not include :remote-user.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

• https://github.com/expressjs/morgan/security/advisories/GHSA-4vj7-5mj6-jm8m
• https://nvd.nist.gov/vuln/detail/CVE-2026-5078
• https://cna.openjsf.org/security-advisories.html
• https://github.com/advisories/GHSA-4vj7-5mj6-jm8m

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Details

Impact

Morgan writes attacker-controlled request data to the access log through its tokens. The 1.11.0 fix neutralizes C0 control characters, DEL, and backslash, but it does not escape the Unicode line separators U+0085 (NEL), U+2028 (LINE SEPARATOR), or U+2029 (PARAGRAPH SEPARATOR). These code points are reachable through several tokens, including the request URL (:url), request headers such as :user-agent and :referrer, arbitrary :req[header] values, and the Basic auth username (:remote-user). NEL is valid obs-text in HTTP header values, so an attacker can place it in an ordinary request header.

When such a value is logged, the raw code points survive into the emitted access-log record, and downstream ECMAScript-aware or Unicode-aware log processing splits the single physical record into multiple logical records. This allows an attacker to forge log entries. The built-in combined, common, default, and short formats are affected, as well as any custom format. This is an incomplete fix of CVE-2026-5078.

Patches

Users should upgrade to version 1.12.0.

Workarounds

None. The affected values include the request URL and request headers, which are core to access logging, so there is no practical format-based mitigation. Upgrade to 1.12.0.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

• https://github.com/expressjs/morgan/security/advisories/GHSA-jxfw-x594-9x9m
• https://nvd.nist.gov/vuln/detail/CVE-2026-15603
• https://github.com/expressjs/morgan/commit/fbf93833186920cc39bb19b247e4a86b61bef4fe
• https://cna.openjsf.org/security-advisories.html
• https://github.com/expressjs/morgan/releases/tag/1.12.0
• https://github.com/advisories/GHSA-jxfw-x594-9x9m

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

v1.12.0

Compare Source

======

• Security fix for CVE-2026-15603(GHSA-jxfw-x594-9x9m)
• Allow format functions to return objects for streams in objectMode
• Respect the NO_COLOR environment variable in the dev format

v1.11.0

Compare Source

===================

• add :pid token

Security Fix:

• Escape control characters in :remote-user token to prevent log injection
  • Fixes CVE-2026-5078 GHSA-4vj7-5mj6-jm8m

v1.10.1

Compare Source

===================

• deps: on-headers@~1.1.0
  • Fix CVE-2025-7339 (GHSA-76c9-3jph-rj3q)