Picomatch through 4.0.7 ReDoS via single-branch repeated extglob patterns

Advisories

Picomatch through 4.0.7 ReDoS via single-branch repeated extglob patterns

Severity: high
Date: 10/19/2026
Affecting: picomatch <= 4.0.7
CVE: CVE-2026-112366
CWE: CWE-1333 Inefficient Regular Expression Complexity
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: https://github.com/micromatch/picomatch/pull/194
https://github.com/micromatch/picomatch/blob/4.0.7/lib/parse.js#L287-L307
Credit: maximilliangrand, Zachariah Mithani
Description: Picomatch through 4.0.7 contains a regular expression denial of service vulnerability that allows attackers to block the event loop by supplying single-branch repeated extglob patterns. Attackers can provide globs like +(*) or +(*a), which analyzeRepeatedExtglob in lib/parse.js skips, causing exponential backtracking against short crafted strings and denying service to Node.js applications.

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