{"id":"UBUNTU-CVE-2026-1527","details":"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` }","modified":"2026-05-20T16:24:07.881676613Z","published":"2026-03-12T21:16:00Z","upstream":["CVE-2026-1527"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-1527"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-1527"}],"affected":[{"package":{"name":"node-undici","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-undici?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1","5.26.3+dfsg1+~cs23.10.12-2"],"ecosystem_specific":{"binaries":[{"binary_version":"9.1.3~5.26.3+dfsg1+~cs23.10.12-2","binary_name":"node-llhttp"},{"binary_name":"node-undici","binary_version":"5.26.3+dfsg1+~cs23.10.12-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1527.json"}},{"package":{"name":"node-undici","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-undici?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.3.0+dfsg1+~cs24.12.11-1","7.3.0+dfsg1+~cs24.12.11-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libllhttp9.2","binary_version":"9.2.1~7.3.0+dfsg1+~cs24.12.11-2"},{"binary_name":"node-llhttp","binary_version":"9.2.1~7.3.0+dfsg1+~cs24.12.11-2"},{"binary_name":"node-undici","binary_version":"7.3.0+dfsg1+~cs24.12.11-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1527.json"}},{"package":{"name":"node-undici","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-undici?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.3.0+dfsg1+~cs24.12.11-2","7.16.0+dfsg+~cs3.2.0-2","7.18.2+dfsg+~cs3.2.0-1","7.18.2+dfsg+~cs3.2.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"7.18.2+dfsg+~cs3.2.0-1build1","binary_name":"node-undici"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1527.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}