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CVE-2026-5078

morgan vulnerable to Log Forging via unneutralized control characters in :remote-user

CVSS 3.1 5.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-5078

Published

Impact: The morgan logging middleware's :remote-user token extracts the Basic auth username from the Authorization request header and writes it to the log stream without neutralizing control characters. An unauthenticated attacker can send a crafted Authorization Basic header containing CR or LF bytes to inject forged log lines, breaking the one-request-per-line structure of access logs and enabling log forgery against downstream log consumers. The built-in combined, common, default, and short formats are affected, as well as any custom format that references :remote-user. Affected versions: morgan 1.2.0 through 1.10.1. Patches: upgrade to morgan 1.11.0, which neutralizes control characters in the :remote-user token output. Workarounds: use a custom format string that does not include :remote-user.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-5078

Published

morgan

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "morgan",
                    "product": "morgan",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.2.0",
                            "lessThanOrEqual": "1.10.1",
                            "versionType": "semver"
                        },
                        {
                            "status": "unaffected",
                            "version": "1.11.0",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/morgan"
                }

Original source record · Cite this exact observation · Complete original publisher JSON