{"id":"UBUNTU-CVE-2025-64718","details":"js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default).","modified":"2026-05-20T16:23:40.327741091Z","published":"2025-11-13T16:15:00Z","upstream":["CVE-2025-64718"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-64718"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-64718"},{"type":"REPORT","url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m"},{"type":"REPORT","url":"https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879"}],"affected":[{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.1+dfsg-1","3.10.0+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-js-yaml","binary_version":"3.10.0+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.json"}},{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.13.1+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"node-js-yaml","binary_version":"3.13.1+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.json"}},{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.14.1+dfsg+~3.12.6-2","4.1.0+dfsg+~4.0.5-4ubuntu1","4.1.0+dfsg+~4.0.5-5","4.1.0+dfsg+~4.0.5-6"],"ecosystem_specific":{"binaries":[{"binary_name":"node-js-yaml","binary_version":"4.1.0+dfsg+~4.0.5-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.json"}},{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0+dfsg+~4.0.5-7"],"ecosystem_specific":{"binaries":[{"binary_version":"4.1.0+dfsg+~4.0.5-7","binary_name":"node-js-yaml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.json"}},{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0+dfsg+~4.0.5-7"],"ecosystem_specific":{"binaries":[{"binary_name":"node-js-yaml","binary_version":"4.1.0+dfsg+~4.0.5-7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.json"}},{"package":{"name":"node-js-yaml","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-js-yaml?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0+dfsg+~4.0.5-7","4.1.1+dfsg+~4.0.9-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.1.1+dfsg+~4.0.9-1","binary_name":"node-js-yaml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-64718.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:L/A:N"},{"type":"Ubuntu","score":"medium"}]}