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

Quick assessment

Affected
shell-quote
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

shell-quote是Jordan Harband个人开发者的一个软件包。用于解析和引用 shell 命令。 shell-quote存在安全漏洞，该漏洞源于quote函数未验证对象令牌输入与parse使用的运算符模型，导致换行符等行终止符未转义，可能被POSIX shell解释为命令分隔符，从而执行后续内容。以下版本受到影响：shell-quote。

CVSS 8.1 · High EPSS 0.85% · P55

Affected Version Matrix 1

VendorProduct Version RangeStatus
None shell-quote 1.1.0< 1.8.4 affected
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I. Basic Information for CVE-2026-9277

Vulnerability Information
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Vulnerability Title
shell-quote `quote()` does not validate object-token shapes, allowing command injection via line terminators in `.op`
Source: CVE Program / CVE List V5
Vulnerability 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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
shell-quote 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
shell-quote是Jordan Harband个人开发者的一个软件包。用于解析和引用 shell 命令。 shell-quote存在安全漏洞，该漏洞源于quote函数未验证对象令牌输入与parse使用的运算符模型，导致换行符等行终止符未转义，可能被POSIX shell解释为命令分隔符，从而执行后续内容。以下版本受到影响：shell-quote。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- shell-quote 1.1.0 ~ 1.8.4 -

II. Public POCs for CVE-2026-9277

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10365 chars
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III. Intelligence Information for CVE-2026-9277

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Patches & Fixes for CVE-2026-9277 (1)

Vendor Advisories for CVE-2026-9277 (1)

Other References for CVE-2026-9277 (1)

IV. Related Vulnerabilities

Same product: shell-quote
Same weakness: CWE-78

V. Comments for CVE-2026-9277

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