GHSA-3v7f-55p6-f55p · Severity: medium · Ecosystem: npm — Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching
Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to a method injection vulnerability affecting the `POSIX_REGEX_SOURCE` object. Because the object inherits from `Object.prototype`, specially crafted POSIX bracket expressions (e.g., `[[:constructor:]]`) can reference inherited method names. These methods are implicitly converted to strings and injected into the generated regular expression. This leads to incorrect glob matching behavior (integrity impact), where patterns may match unintended filenames. The issue does not enable remote code execution, but it can cause security-relevant logic errors in applications that rely on glob matching for filtering, validation, or access control. All users of affected `picomatch` versions that process untrusted or user-controlled glob patterns are potentially impacted. 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 sanitizing or rejecting untrusted glob patterns, especially those containing POSIX character classes like `[[:...:]]`; avoiding the use of POSIX bracket expressions if user input is involved; and manually patching the library by modifying `POSIX_REGEX_SOURCE` to use a null prototype.
Conclusion & alert: CVE-2026-33672 is rated Low Risk (26.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.05%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-21 | 0.16% | 0.05% | -0.11% |
| 2 | 2026-04-01 | 0.12% | 0.16% | +0.04% |
| 3 | 2026-03-27 | — | 0.12% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
GHSA-3v7f-55p6-f55p · Severity: medium · Ecosystem: npm — Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-33672 not yet assigned priority: Debian including 1 source packages (node-anymatch), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-33672 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-33672 |
ubuntu
|
medium | CVE-2026-33672 medium priority: Ubuntu including 1 source packages (node-anymatch), 6 status rows across 6 suites (bionic, focal, jammy, noble, questing, upstream): needs-triage 5, released 1. | https://ubuntu.com/security/CVE-2026-33672 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| jonschlinkert | picomatch | < 2.3.2 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |
| jonschlinkert | picomatch | >= 3.0.0, < 3.0.2 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |
| jonschlinkert | picomatch | >= 4.0.0, < 4.0.4 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |