Update dependency morgan to v1.12.0 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
morgan	1.11.0 → 1.12.0

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morgan vulnerable to Log Forging via unescaped Unicode line separators

CVE-2026-15603 / GHSA-jxfw-x594-9x9m

More information

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).

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Release Notes

expressjs/morgan (morgan)

v1.12.0

Compare Source

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• 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

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