CVEvulnerability
CVE-2026-1527
4.6 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-03-12
- Last modified
- 2026-06-17
- Assigner
- ce714d77-add3-4f53-aff5-83d477b104bb
- CVSS 3.1 (ce714d77-add3-4f53-aff5-83d477b104bb)
- 4.6 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-93
Description
ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:
* Inject arbitrary HTTP headers
* 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`
}
Affected configurations
• nodejs undici (< 6.24.0)
• nodejs undici (>= 7.0.0 < 7.24.0)
Related
Weakness · CWE (1)
- CWE-93 Improper Neutralization of CRLF Sequences weakness
References
- https://cna.openjsf.org/security-advisories.html Vendor Advisory
- https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq Mitigation, Patch, Vendor Advisory
- https://hackerone.com/reports/3487198 Permissions Required