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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-5078)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-5078)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
444620	SCA: security update for morgan (GHSA-4vj7-5mj6-jm8m)	Tenable Cloud Security	SCA Checks	medium
444620	SCA: security update for morgan (GHSA-4vj7-5mj6-jm8m)	Tenable Self-Hosted Container Security	SCA Checks	medium
318699	Linux Distros Unpatched Vulnerability : CVE-2026-5078	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-5078

medium

Tenable Plugins

medium

medium

medium