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CVE-2026-73413— Shescape: Quadratic-time denial of service in flag-protection

Quick assessment

Affected
ericcornelissen shescape
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.

Eric Cornelissen Shescape是Eric Cornelissen个人开发者开源的一个Shell转义工具库。 Eric Cornelissen Shescape 2.1.11至2.1.14之前版本和3.0.0至3.0.1之前版本存在资源管理错误漏洞，该漏洞源于compose函数中的flag-protection循环在flagProtection启用时重复连接和切片flag片段，导致处理时间随输入大小呈二次增长，攻击者可提供包含大量flag片段的大型不可信输入，消耗CPU并造成拒绝服务。

CVSS 8.7 · High EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
ericcornelissen shescape >= 2.1.11, < 2.1.14 affected
>= 3.0.0, < 3.0.1 affected
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I. Basic Information for CVE-2026-73413

Vulnerability Information
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Vulnerability Title
Shescape: Quadratic-time denial of service in flag-protection
Source: CVE Program / CVE List V5
Vulnerability Description
Shescape is a simple shell escape library for JavaScript. From 2.1.11 until 2.1.14 and 3.0.1, the flag-protection loop in compose in src/internal/compose.js repeatedly joins and slices flag fragments when flagProtection is enabled, which is the default, making processing quadratic in input size across the escape, escapeAll, quote, and quoteAll APIs. An attacker who can supply a large untrusted input containing many flag fragments can consume CPU and cause denial of service. This issue is fixed in versions 2.1.14 and 3.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Eric Cornelissen Shescape 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eric Cornelissen Shescape是Eric Cornelissen个人开发者开源的一个Shell转义工具库。 Eric Cornelissen Shescape 2.1.11至2.1.14之前版本和3.0.0至3.0.1之前版本存在资源管理错误漏洞，该漏洞源于compose函数中的flag-protection循环在flagProtection启用时重复连接和切片flag片段，导致处理时间随输入大小呈二次增长，攻击者可提供包含大量flag片段的大型不可信输入，消耗CPU并造成拒绝服务。
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
ericcornelissen shescape >= 2.1.11, < 2.1.14 -

II. Public POCs for CVE-2026-73413

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 5962 chars
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III. Intelligence Information for CVE-2026-73413

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Patches & Fixes for CVE-2026-73413 (4)

Vendor Advisories for CVE-2026-73413 (1)

Other References for CVE-2026-73413 (2)

Same Patch Batch · ericcornelissen · 2026-08-12 · 4 CVEs total

CVE-2026-73414 9.2 CRITICAL Shescape: Shell injection via unescaped parentheses on Windows with CMD
CVE-2026-73412 6.3 MEDIUM Shescape: Path disclosure on Unix with Zsh
CVE-2026-73411 6.3 MEDIUM Shescape: Home-directory disclosure in assignment context on Unix with Dash

IV. Related Vulnerabilities

Same product: shescape
Same vendor: ericcornelissen
Same weakness: CWE-400

V. Comments for CVE-2026-73413

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