CVE-2026-33672 — Prototype Pollution in Picomatch

CWE-1321 — Prototype PollutionCWE-624 — Executable Regular Expression Error12 documents7 sources
Severity
5.3MEDIUMNVD
EPSS
0.2%
top 62.51%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
7
Micromatch PicomatchJonschlinkert PicomatchDebian Node-anymatch+4 more
Timeline
PublishedMar 26

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 (int…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages8 packages

▶CVEListV5micromatch/picomatch< 2.3.2+2
▶npmmicromatch/picomatch4.0.0 — 4.0.4+2
▶NVDjonschlinkert/picomatch3.0.0 — 3.0.2+2
▶debiandebian/node-anymatch< node-anymatch 3.1.3+~cs8.0.6-1 (forky)

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
OSV
CVE-2026-33672: Picomatch is a glob matcher written JavaScript↗2026-03-26
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OSV
Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching↗2026-03-25
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GHSA
Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching↗2026-03-25
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📋Vendor Advisories

3
Red Hat
picomatch: Picomatch: Data integrity compromised via method injection with crafted POSIX bracket expressions↗2026-03-26
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Microsoft
Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching↗2026-03-10
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Debian
CVE-2026-33672: node-anymatch - Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, ...↗2026
▶

🕵️Threat Intelligence

5
Wiz
CVE-2025-59465 Impact, Exploitability, and Mitigation Steps | Wiz↗
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Wiz
CVE-2025-59466 Impact, Exploitability, and Mitigation Steps | Wiz↗
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Wiz
CVE-2025-55131 Impact, Exploitability, and Mitigation Steps | Wiz↗
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Wiz
CVE-2026-33672 Impact, Exploitability, and Mitigation Steps | Wiz↗
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Wiz
CVE-2026-21637 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-33672 — Prototype Pollution in Picomatch | cvebase