CoreCVE
Back

CRITICAL

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

Published May 22, 2026

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`.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-77

CWE-78

OS Command Injection

References (43)

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED
Assigner harborist
Published May 22, 2026
Updated Sep 14, 2026
Reserved May 22, 2026
Link CVE-2026-9277

CISA Vulnrichment

Updated May 22, 2026

NVD

Status Deferred
Modified Sep 14, 2026
Link CVE-2026-9277

Red Hat

Severity Important
Public date May 22, 2026
Bugzilla 2480741
Link CVE-2026-9277

ENISA EUVD

Assigner harborist
Published May 22, 2026
Updated Sep 14, 2026
Link EUVD-2026-31440

GitHub

Link GHSA-W7JW-789Q-3M8P