CVE-2026-33671: Picomatch is a glob matcher written JavaScript

Q: How do I fix CVE-2026-33671?

picomatch: upgrade to 2.3.2, 3.0.2, 4.0.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33671 being exploited?

CVE-2026-33671 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33671 affect?

CVE-2026-33671 affects picomatch. Severity is high (CVSS 7.5). 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 su

Q: How urgent is CVE-2026-33671?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-33671 is a high-severity flaw (CVSS 7.5) affecting picomatch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. Applicat

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: jonschlinkert

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 22:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

jonschlinkert picomatch UPGRADE

Affected: < 2.3.2 · >= 3.0.0 and < 3.0.2 · >= 4.0.0 and < 4.0.4

Fixed in: 2.3.2, 3.0.2, 4.0.4

Safe to downgrade to: a release before 3.0.0

1. Check installed version

npm ls picomatch

2. UPGRADE to 2.3.2

npm install picomatch@">=2.3.2"

3. If no update is available yet, DOWNGRADE to a release before 3.0.0

npm view picomatch versions npm install picomatch@"<3.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33671?

picomatch: upgrade to 2.3.2, 3.0.2, 4.0.4. Exact commands for each OS are on this page.

Is CVE-2026-33671 being exploited?

CVE-2026-33671 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33671 affect?

CVE-2026-33671 affects picomatch. Severity is high (CVSS 7.5). 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 su

How urgent is CVE-2026-33671?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-33672 MEDIUM 5.3 UPGRADE Picomatch is a glob matcher written JavaScript

References

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