CVE-2026-9277 - shell-quote `quote()` does not validate object-token shapes, allowing command injection via line terminators in `.op`

CVE-2026-9277 - shell-quote `quote()` does not validate object-token shapes, allowing command injection via line terminators in `.op`

https://cvefeed.io/rssfeed/latest.atom / Fri, 05/22/2026 - 17:24
CVE ID :CVE-2026-9277
Published : May 22, 2026, 1:22 p.m. | 1 hour, 36 minutes ago
Description :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`.
Severity: 9.2 | CRITICAL
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