Shescape: Quadratic-time denial of service in flag-protection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73413
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 20:17:56 UTC
Updated2026-08-12 20:17:56 UTC
DescriptionShescape 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-400 | CWE-407 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ericcornelissen Shescape affected >= 2.1.11, < 2.1.14 Not specified
CNA Ericcornelissen Shescape affected >= 3.0.0, < 3.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/ericcornelissen/shescape/pull/2651 [email protected] github.com
github.com/ericcornelissen/shescape/releases/tag/v3.0.1 [email protected] github.com
github.com/ericcornelissen/shescape/pull/2649 [email protected] github.com
github.com/ericcornelissen/shescape/commit/b4b34c394e7f9da2775bb75381066... [email protected] github.com
github.com/ericcornelissen/shescape/commit/43d70b59d09bbe5c3fd02ef08b3a1... [email protected] github.com
github.com/ericcornelissen/shescape/releases/tag/v2.1.14 [email protected] github.com
github.com/ericcornelissen/shescape/security/advisories/GHSA-gm3r-q2wp-hw87 [email protected] github.com
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