GHSA-c2c7-rcm5-vvqj · Severity: high · Ecosystem: npm — Picomatch has a ReDoS vulnerability via extglob quantifiers
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.
Conclusion & alert: CVE-2026-33671 is rated Low Risk (31.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.02%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-21 | 0.05% | 0.02% | -0.03% |
| 2 | 2026-04-01 | 0.04% | 0.05% | +0.01% |
| 3 | 2026-03-27 | — | 0.04% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-c2c7-rcm5-vvqj · Severity: high · Ecosystem: npm — Picomatch has a ReDoS vulnerability via extglob quantifiers
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-33671 not yet assigned priority: Debian including 1 source packages (node-anymatch), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-33671 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-33671 |
ubuntu
|
medium | CVE-2026-33671 medium priority: Ubuntu including 1 source packages (node-anymatch), 6 status rows across 6 suites (bionic, focal, jammy, noble, questing, upstream): needs-triage 5, released 1. | https://ubuntu.com/security/CVE-2026-33671 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| jonschlinkert | picomatch | < 2.3.2 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |
| jonschlinkert | picomatch | >= 3.0.0, < 3.0.2 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |
| jonschlinkert | picomatch | >= 4.0.0, < 4.0.4 | cpe:2.3:a:jonschlinkert:picomatch:*:*:*:*:*:node.js:*:* |