GHSA-4992-7rv2-5pvq

Suggest an improvement
Source
https://github.com/advisories/GHSA-4992-7rv2-5pvq
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4992-7rv2-5pvq/GHSA-4992-7rv2-5pvq.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4992-7rv2-5pvq
Aliases
Downstream
CGA (58)
MINI (10)
Published
2026-03-13T20:41:26Z
Modified
2026-09-10T03:50:37Z
Severity
  • 4.6 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Undici has CRLF Injection in undici via `upgrade` option
Details

Impact

When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  1. Inject arbitrary HTTP headers
  2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)

The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121
if (upgrade) {
  header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

Sanitize the upgrade option string before passing to undici:

function sanitizeUpgrade(value) {
  if (/[\r\n]/.test(value)) {
    throw new Error('Invalid upgrade value')
  }
  return value
}

client.request({
  upgrade: sanitizeUpgrade(userInput)
})
Database specific 
{
    "cwe_ids":  [
        "CWE-93"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-03-13T20:41:26Z",
    "nvd_published_at":  "2026-03-12T21:16:25Z",
    "severity":  "MODERATE"
}
References

Affected packages

npm / undici

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.24.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4992-7rv2-5pvq/GHSA-4992-7rv2-5pvq.json"

npm / undici

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
7.0.0
Fixed
7.24.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4992-7rv2-5pvq/GHSA-4992-7rv2-5pvq.json"