GHSA-9f6g-j8ch-79g4

Suggest an improvement
Source
https://github.com/advisories/GHSA-9f6g-j8ch-79g4
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9f6g-j8ch-79g4/GHSA-9f6g-j8ch-79g4.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-9f6g-j8ch-79g4
Aliases
Downstream
CGA (14)
Published
2026-09-28T21:33:08Z
Modified
2026-09-28T21:45:03Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
morgan vulnerable to Log Injection via unescaped double quote in quoted log fields
Details

Impact

Morgan writes attacker-controlled request data to the access log. Its escaping (added in 1.11.0 and 1.12.0) neutralizes control characters, the Unicode line separators, and backslash, but not the double quote (0x22), which is the field delimiter of the Apache combined log format morgan emits. An attacker who controls a quoted field (:user-agent, :referrer, the request URL, or the Basic auth :remote-user) can inject a double quote to close the field early and forge additional fields in the log record. The combined, common, and default formats, and any custom format that quotes a token, are affected. This is an incomplete fix of CVE-2026-5078 and CVE-2026-15603.

Patches

Users should upgrade to version 1.12.1.

Workarounds

Update to version 1.12.1.

Database specific 
{
    "cwe_ids":  [
        "CWE-117"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-28T21:33:08Z",
    "nvd_published_at":  "2026-09-11T10:16:53Z",
    "severity":  "MODERATE"
}
References

Affected packages

npm / morgan

Package

Name
morgan
View open source insights on deps.dev
Purl
pkg:npm/morgan

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.12.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9f6g-j8ch-79g4/GHSA-9f6g-j8ch-79g4.json"