{"id":"UBUNTU-CVE-2026-12151","details":"Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service. Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint. All releases starting at undici 6.17.0 are affected. Patches: Upgrade to undici \u003e= 6.26.0, \u003e= 7.28.0, or \u003e= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.","modified":"2026-06-30T18:15:32.620723564Z","published":"2026-06-17T17:16:00Z","upstream":["CVE-2026-12151"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-12151"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-12151"},{"type":"REPORT","url":"https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q"}],"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_name":"node-llhttp","binary_version":"9.1.3~5.26.3+dfsg1+~cs23.10.12-2"},{"binary_version":"5.26.3+dfsg1+~cs23.10.12-2","binary_name":"node-undici"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12151.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_version":"9.2.1~7.3.0+dfsg1+~cs24.12.11-2","binary_name":"node-llhttp"},{"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-2026-12151.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-2026-12151.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}