dbcve.org
PicomatchApplication · Jonschlinkert

CVE-2026-33672

MEDIUM · 5.3 CVSS v3.1 Published 2026-03-26
Fix available
A fix is available. Upgrade to 2.3.2 / 3.0.2 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
PicomatchApplication
Affected:< 2.3.2>= 3.0.0, < 3.0.2>= 4.0.0, < 4.0.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 2.3.2 / 3.0.2 / 4.0.4 or later
Fixed in 2.3.23.0.24.0.4
Vendor patch github.com →
Recommended fix High confidence

picomatch 4.0.4 (or 3.0.2/2.3.2 depending on release line)

  1. 1. Identify the current picomatch version in your project by checking package.json or running `npm list picomatch`
  2. 2. Determine which release line (2.x, 3.x, or 4.x) is appropriate for your project based on dependencies and compatibility requirements
  3. 3. Upgrade picomatch to the fixed version for your release line: run `npm install [email protected]` for the latest stable release, or `npm install [email protected]` / `npm install [email protected]` for specific release lines
  4. 4. Run your test suite to verify glob matching behavior remains correct after the upgrade
  5. 5. Rebuild and redeploy your application
Caveat Upgrade should be low-risk as this is a bugfix; however, review the picomatch changelog for your version jump to check for any behavior changes in glob matching

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-33672 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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