{"id":"UBUNTU-CVE-2026-9277","details":"shell-quote's `quote()` function did not validate object-token inputs against the operator model used by `parse()`. The `.op` field was backslash-escaped character by character using `/(.)/g`, which in JavaScript does not match line terminators (\\n, \\r, U+2028, U+2029). A line terminator in `.op` therefore passed through unescaped into the output; POSIX shells treat a literal newline as a command separator, so any content after it would execute as a second command. The vulnerable code path is reachable in two ways: (1) direct construction of `{ op: '...\\n...' }` from external input, and (2) via `parse(cmd, envFn)` when `envFn` returns object tokens whose `.op` is attacker-influenced. Both are documented API surface. Fixed by replacing the per-character escape with strict shape validation: `.op` must match the parser's control-operator allowlist; `{ op: 'glob', pattern }` validates `pattern` and forbids line terminators; `{ comment }` validates `comment` and forbids line terminators; any other object shape throws `TypeError`.","modified":"2026-06-30T18:18:17.533240370Z","published":"2026-05-22T14:16:00Z","related":["USN-8410-1"],"upstream":["CVE-2026-9277"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-9277"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-9277"},{"type":"REPORT","url":"https://github.com/ljharb/shell-quote/security/advisories/GHSA-w7jw-789q-3m8p"},{"type":"REPORT","url":"https://github.com/ljharb/shell-quote"},{"type":"REPORT","url":"https://github.com/ljharb/shell-quote/commit/1518179"},{"type":"REPORT","url":"https://www.npmjs.com/package/shell-quote"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2026/05/23/2"},{"type":"REPORT","url":"https://github.com/ljharb/shell-quote/commit/4378a6e613db5948168684864e49b42b83134d2d"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8410-1"}],"affected":[{"package":{"name":"node-shell-quote","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/node-shell-quote?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1+20160617-git72fb5a8ce29b-1ubuntu0.1~esm1"}]}],"versions":["1.6.1+20160617-git72fb5a8ce29b-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.1+20160617-git72fb5a8ce29b-1ubuntu0.1~esm1","binary_name":"node-shell-quote"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9277.json"}},{"package":{"name":"node-shell-quote","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/node-shell-quote?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.3+~1.7.1-1ubuntu0.1~esm1"}]}],"versions":["1.7.3+~1.7.1-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"node-shell-quote","binary_version":"1.7.3+~1.7.1-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9277.json"}},{"package":{"name":"node-shell-quote","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-shell-quote?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.4+~1.7.1-1ubuntu0.24.04.1"}]}],"versions":["1.7.4+~1.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-shell-quote","binary_version":"1.7.4+~1.7.1-1ubuntu0.24.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9277.json"}},{"package":{"name":"node-shell-quote","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-shell-quote?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.4+~1.7.1-1ubuntu0.25.10.1"}]}],"versions":["1.7.4+~1.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.4+~1.7.1-1ubuntu0.25.10.1","binary_name":"node-shell-quote"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9277.json"}},{"package":{"name":"node-shell-quote","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/node-shell-quote?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.3+~1.7.5-1ubuntu0.1~esm1"}]}],"versions":["1.7.4+~1.7.1-1","1.8.3+~1.7.5-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"node-shell-quote","binary_version":"1.8.3+~1.7.5-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9277.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}