GHSA-3v7f-55p6-f55p

Source

https://github.com/advisories/GHSA-3v7f-55p6-f55p

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3v7f-55p6-f55p/GHSA-3v7f-55p6-f55p.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-3v7f-55p6-f55p

Aliases

CVE-2026-33672

Related

CGA-h3vp-4fv3-55pp

Published

2026-03-25T21:13:39Z

Modified

2026-03-28T00:14:20.953909Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator

Summary

Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching

Details

Impact

picomatch is vulnerable to a method injection vulnerability (CWE-1321) 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.

Patches

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.

Workarounds

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. - Manually patching the library by modifying POSIX_REGEX_SOURCE to use a null prototype:

```js const POSIXREGEXSOURCE = { proto: null, alnum: 'a-zA-Z0-9', alpha: 'a-zA-Z', // ... rest unchanged };

Resources

fix for similar issue: https://github.com/micromatch/picomatch/pull/144
picomatch repository https://github.com/micromatch/picomatch

Database specific

{
    "nvd_published_at": "2026-03-26T22:16:30Z",
    "github_reviewed_at": "2026-03-25T21:13:39Z",
    "cwe_ids": [
        "CWE-1321"
    ],
    "severity": "MODERATE",
    "github_reviewed": true
}

References

Affected packages

npm / picomatch

Package

Name: picomatch; View open source insights on deps.dev
Purl: pkg:npm/picomatch

Affected ranges

Type: SEMVER
Events: Introduced

4.0.0

Fixed

4.0.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3v7f-55p6-f55p/GHSA-3v7f-55p6-f55p.json"

npm / picomatch

Package

Name: picomatch; View open source insights on deps.dev
Purl: pkg:npm/picomatch

Affected ranges

Type: SEMVER
Events: Introduced

3.0.0

Fixed

3.0.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3v7f-55p6-f55p/GHSA-3v7f-55p6-f55p.json"

npm / picomatch

Package

Name: picomatch; View open source insights on deps.dev
Purl: pkg:npm/picomatch

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.3.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3v7f-55p6-f55p/GHSA-3v7f-55p6-f55p.json"