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CVE-2026-33671— Picomatch has a ReDoS vulnerability via extglob quantifiers

Quick assessment

Affected
micromatch picomatch
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Picomatch是micromatch开源的一个JavaScript编写的快速且准确的Glob模式匹配库。 Picomatch 4.0.4之前版本、3.0.2之前版本和2.3.2之前版本存在安全漏洞，该漏洞源于处理特制extglob模式时存在正则表达式拒绝服务，可能导致CPU消耗过度和拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P41
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I. Basic Information for CVE-2026-33671

Vulnerability Information
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Vulnerability Title
Picomatch has a ReDoS vulnerability via extglob quantifiers
Source: CVE Program / CVE List V5
Vulnerability Description
Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) when processing crafted extglob patterns. Certain patterns using extglob quantifiers such as `+()` and `*()`, especially when combined with overlapping alternatives or nested extglobs, are compiled into regular expressions that can exhibit catastrophic backtracking on non-matching input. Applications are impacted when they allow untrusted users to supply glob patterns that are passed to `picomatch` for compilation or matching. In those cases, an attacker can cause excessive CPU consumption and block the Node.js event loop, resulting in a denial of service. Applications that only use trusted, developer-controlled glob patterns are much less likely to be exposed in a security-relevant way. 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 disabling extglob support for untrusted patterns by using `noextglob: true`, rejecting or sanitizing patterns containing nested extglobs or extglob quantifiers such as `+()` and `*()`, enforcing strict allowlists for accepted pattern syntax, running matching in an isolated worker or separate process with time and resource limits, and applying application-level request throttling and input validation for any endpoint that accepts glob patterns.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Picomatch 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Picomatch是micromatch开源的一个JavaScript编写的快速且准确的Glob模式匹配库。 Picomatch 4.0.4之前版本、3.0.2之前版本和2.3.2之前版本存在安全漏洞，该漏洞源于处理特制extglob模式时存在正则表达式拒绝服务，可能导致CPU消耗过度和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
micromatch picomatch >= 4.0.0, < 4.0.4 -

II. Public POCs for CVE-2026-33671

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6620 chars
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III. Intelligence Information for CVE-2026-33671

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Patches & Fixes for CVE-2026-33671 (1)

Vendor Advisories for CVE-2026-33671 (1)

IV. Related Vulnerabilities

Same product: picomatch
Same vendor: micromatch
Same weakness: CWE-1333

V. Comments for CVE-2026-33671

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