UBUNTU-CVE-2026-1527

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-1527
Published: 12 Mar 2026, 21:16
Last modified:20 May 2026, 16:24

Vulnerability Summary

Overall Risk (default)
low
18/100
CVSS Score
4.6 MEDIUM
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 Mar 2026, 21:16
Published
Vulnerability first disclosed
20 May 2026, 16:24
Last Modified
Vulnerability information updated

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` }

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Affected Systems

  • ubuntu•node-undici

    all | all | all

References (2)