What is CVE-2026-33672?

CVE-2026-33672 is a medium-severity vulnerability in Micromatch Picomatch, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2026-03-26.

How severe is CVE-2026-33672?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Prototype Pollution in Micromatch Picomatch

CVE-2026-33672

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`, sp…

Vulnerability class: Prototype Pollution

EPSS: 0.001 (18.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 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.

Affected products

Micromatch Picomatch — versions >= 4.0.0, < 4.0.4, >= 3.0.0, < 3.0.2, < 2.3.2

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

https://github.com/micromatch/picomatch/security/advisories/GHSA-3v7f-55p6-f55p (x_refsource_CONFIRM)
https://github.com/micromatch/picomatch/commit/4516eb521f13a46b2fe1a1d2c9ef6b20ddc0e903 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33672?: CVE-2026-33672 is a medium-severity vulnerability in Micromatch Picomatch, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2026-03-26.
How severe is CVE-2026-33672?: Medium severity. CVSS v3 base score is 5.3 out of 10.