CVE-2026-9277

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`.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
node-shell-quote	26.04 LTS resolute	Fixed 1.8.3+~1.7.5-1ubuntu0.1~esm1
	25.10 questing	Fixed 1.7.4+~1.7.1-1ubuntu0.25.10.1
	24.04 LTS noble	Fixed 1.7.4+~1.7.1-1ubuntu0.24.04.1
	22.04 LTS jammy	Fixed 1.7.3+~1.7.1-1ubuntu0.1~esm1
	18.04 LTS bionic	Fixed 1.6.1+20160617-git72fb5a8ce29b-1ubuntu0.1~esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
node-shell-quote	Upstream: 4378a6e

Severity score breakdown

Parameter	Value
Base score	8.1 · High
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-8410-1
shell-quote vulnerability
9 June 2026

Cvss 3 Severity Score