CVE-2026-33671 - High Severity Vulnerability
Vulnerable Library - picomatch-2.2.2.tgz
Blazing fast and accurate glob matcher written in JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions.
Library home page: https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz
Path to dependency file: /day59/package.json
Path to vulnerable library: /day59/package.json,/day60/package.json
Dependency Hierarchy:
- browser-sync-2.26.13.tgz (Root Library)
- micromatch-4.0.2.tgz
- ❌ picomatch-2.2.2.tgz (Vulnerable Library)
Found in HEAD commit: c88b9429eb68a85b22f0e39cac7bf20b89cb6709
Found in base branch: master
Vulnerability Details
Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) when processing crafted extglob patterns. Certain patterns using extglob quantifiers such as "+()" and "()", especially when combined with overlapping alternatives or nested extglobs, are compiled into regular expressions that can exhibit catastrophic backtracking on non-matching input. Applications are impacted when they allow untrusted users to supply glob patterns that are passed to "picomatch" for compilation or matching. In those cases, an attacker can cause excessive CPU consumption and block the Node.js event loop, resulting in a denial of service. Applications that only use trusted, developer-controlled glob patterns are much less likely to be exposed in a security-relevant way. This issue is fixed in picomatch 4.0.4, 3.0.2 and 2.3.2. Users should upgrade to one of these versions or later, depending on their supported release line. If upgrading is not immediately possible, avoid passing untrusted glob patterns to "picomatch". Possible mitigations include disabling extglob support for untrusted patterns by using "noextglob: true", rejecting or sanitizing patterns containing nested extglobs or extglob quantifiers such as "+()" and "()", enforcing strict allowlists for accepted pattern syntax, running matching in an isolated worker or separate process with time and resource limits, and applying application-level request throttling and input validation for any endpoint that accepts glob patterns.
Publish Date: 2026-03-26
URL: CVE-2026-33671
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Release Date: 2026-03-25
Fix Resolution: https://github.com/micromatch/picomatch.git - 3.0.2,https://github.com/micromatch/picomatch.git - 4.0.4,https://github.com/micromatch/picomatch.git - 2.3.2
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CVE-2026-33671 - High Severity Vulnerability
Blazing fast and accurate glob matcher written in JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions.
Library home page: https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz
Path to dependency file: /day59/package.json
Path to vulnerable library: /day59/package.json,/day60/package.json
Dependency Hierarchy:
Found in HEAD commit: c88b9429eb68a85b22f0e39cac7bf20b89cb6709
Found in base branch: master
Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) when processing crafted extglob patterns. Certain patterns using extglob quantifiers such as "+()" and "()", especially when combined with overlapping alternatives or nested extglobs, are compiled into regular expressions that can exhibit catastrophic backtracking on non-matching input. Applications are impacted when they allow untrusted users to supply glob patterns that are passed to "picomatch" for compilation or matching. In those cases, an attacker can cause excessive CPU consumption and block the Node.js event loop, resulting in a denial of service. Applications that only use trusted, developer-controlled glob patterns are much less likely to be exposed in a security-relevant way. This issue is fixed in picomatch 4.0.4, 3.0.2 and 2.3.2. Users should upgrade to one of these versions or later, depending on their supported release line. If upgrading is not immediately possible, avoid passing untrusted glob patterns to "picomatch". Possible mitigations include disabling extglob support for untrusted patterns by using "noextglob: true", rejecting or sanitizing patterns containing nested extglobs or extglob quantifiers such as "+()" and "()", enforcing strict allowlists for accepted pattern syntax, running matching in an isolated worker or separate process with time and resource limits, and applying application-level request throttling and input validation for any endpoint that accepts glob patterns.
Publish Date: 2026-03-26
URL: CVE-2026-33671
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Type: Upgrade version
Release Date: 2026-03-25
Fix Resolution: https://github.com/micromatch/picomatch.git - 3.0.2,https://github.com/micromatch/picomatch.git - 4.0.4,https://github.com/micromatch/picomatch.git - 2.3.2
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