CVE-2026-5078
Description
A flaw was found in the morgan HTTP request logging middleware. The :remote-user token writes the Basic auth username to access logs without neutralizing CR/LF control characters. An unauthenticated remote attacker can inject forged log lines via a crafted Authorization header, breaking one-request-per-line log structure and enabling log forgery against downstream consumers.
Statement
The morgan npm logging middleware is vulnerable to log forgery via unneutralized control characters in the :remote-user token extracted from Basic Authorization headers. A remote unauthenticated attacker can send crafted requests to inject forged log lines, impacting log integrity. Built-in combined, common, default, and short formats are affected; fixed in morgan 1.11.0. Affects ODF mcg-core, RHDH, hummingbird nodejs, cryostat, AAP portal, and other npm morgan consumers.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
