CVE-2026-33672
Description
A flaw was found in picomatch, a JavaScript glob matcher. A remote attacker could exploit a method injection vulnerability by providing specially crafted POSIX bracket expressions, such as [[:constructor:]]. This allows the attacker to inject inherited method names into generated regular expressions, leading to incorrect glob matching behavior. This issue can cause security-relevant logic errors in applications that use picomatch for filtering, validation, or access control, potentially compromising data integrity.
Mitigation
To mitigate this issue, applications should sanitize or reject untrusted glob patterns, particularly those containing POSIX character classes like `[[:...:]]`. Avoid using POSIX bracket expressions if user input is involved. No service restart or reload is typically required for this operational control, but applications should be re-evaluated to ensure proper input handling.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability
Technical Impact: Execute Unauthorized Code or Commands
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
