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CVE-2026-5078

CVE-2026-5078 · morgan vulnerable to Log Forging via unneutralized control characters in :remote-user

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • morgan

    Versions
    • ≥ 1.2.0, ≤ 1.10.1: Affected (semver)
    • 1.11.0: Not affected (semver)

    Update to 1.11.0

  • node-morgan Debian:12

    Versions
    • 1.10.0+~1.9.3-1
    • 1.10.1+~1.9.10-1
    • 1.12.0+~1.9.10-1
    • 1.12.1+~1.9.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Debian:13

    Versions
    • 1.10.0+~1.9.3-1
    • 1.10.1+~1.9.10-1
    • 1.12.0+~1.9.10-1
    • 1.12.1+~1.9.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Debian:14

    Versions
    • 1.10.0+~1.9.3-1
    • 1.10.1+~1.9.10-1
    Affected ranges
    • ECOSYSTEM: < 1.12.0+~1.9.10-1

    Update to 1.12.0+~1.9.10-1

  • morgan npm

    Affected ranges
    • SEMVER: ≥ 1.2.0, < 1.11.0

    Update to 1.11.0

  • node-morgan Ubuntu:22.04:LTS

    Versions
    • 1.10.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Ubuntu:24.04:LTS

    Versions
    • 1.10.0+~1.9.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Ubuntu:25.10

    Versions
    • 1.10.0+~1.9.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Ubuntu:26.10

    Versions
    • 1.10.1+~1.9.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-morgan Ubuntu:26.04:LTS

    Versions
    • 1.10.0+~1.9.3-1
    • 1.10.1+~1.9.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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