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Security Advisories

CVE-2026-1527

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-1527

Severity

4.6

Medium

CVSS V3

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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 }

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-1527
  • https://github.com/advisories/GHSA-4992-7rv2-5pvq
  • https://cna.openjsf.org/security-advisories.html
  • https://hackerone.com/reports/3487198
  • https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq

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