CVE WatchJul 15, 2026

CVE-2026-9277

shell-quote's `quote()` function did not validate object-token inputs against the operator model used by `parse()`. The `.op` field was back

CVSS

8.1

High

EPSS

0.8%

p54

KEV

—

Exploit Today

0-100

Published: May 22, 2026 · Last modified: Jul 15, 2026 · CWE-77 · CWE-78

EPSS · 30d

0.8%EPSS · 30 days0.8%

2026-06-302026-07-16

Technical 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`.

Official references

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