NVD - CVE-2026-33672 (original) (raw)
CVE-2026-33672 Detail
Description
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.
Metrics
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CVSS 4.0 Severity and Vector Strings:
NIST: NVD
N/A
NVD assessment not yet provided.
CVSS 3.x Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
CNA: GitHub, Inc.
Base Score: 5.3 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0 Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/micromatch/picomatch/commit/4516eb521f13a46b2fe1a1d2c9ef6b20ddc0e903 | GitHub, Inc. | Patch |
| https://github.com/micromatch/picomatch/security/advisories/GHSA-3v7f-55p6-f55p | GitHub, Inc. | Patch Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1321 | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') | GitHub, Inc. |
Known Affected Software Configurations Switch to CPE 2.2
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Change History
2 change records found show changes
Initial Analysis by NIST 4/01/2026 9:44:53 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CPE Configuration | OR *cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* versions up to (excluding) 2.3.2 *cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* versions from (including) 3.0.0 up to (excluding) 3.0.2 *cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* versions from (including) 4.0.0 up to (excluding) 4.0.4 | |
| Added | Reference Type | GitHub, Inc.: https://github.com/micromatch/picomatch/commit/4516eb521f13a46b2fe1a1d2c9ef6b20ddc0e903 Types: Patch | |
| Added | Reference Type | GitHub, Inc.: https://github.com/micromatch/picomatch/security/advisories/GHSA-3v7f-55p6-f55p Types: Patch, Vendor Advisory |
New CVE Received from GitHub, Inc. 3/26/2026 6:16:30 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Description | 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. | |
| Added | CVSS V3.1 | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | |
| Added | CWE | CWE-1321 | |
| Added | Reference | https://github.com/micromatch/picomatch/commit/4516eb521f13a46b2fe1a1d2c9ef6b20ddc0e903 | |
| Added | Reference | https://github.com/micromatch/picomatch/security/advisories/GHSA-3v7f-55p6-f55p |
Quick Info
CVE Dictionary Entry:
CVE-2026-33672
NVD Published Date:
03/26/2026
NVD Last Modified:
04/01/2026
Source:
GitHub, Inc.