CVE-2026-5078
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 stre…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | morgan | >= 1.2.0, <= 1.10.1 | 1.11.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Morgan Project | Morgan | from 1.2.0 before 1.11.0 |