CVE-2026-33672: Picomatch is a glob matcher written JavaScript

Q: How do I fix CVE-2026-33672?

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

Q: Is CVE-2026-33672 being exploited?

CVE-2026-33672 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-2026-33672 affect?

CVE-2026-33672 affects picomatch. Severity is medium (CVSS 5.3). 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`, spe

Q: How urgent is CVE-2026-33672?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-33672 is a medium-severity flaw (CVSS 5.3) 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 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. T

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-1321
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-2026-33672?

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

Is CVE-2026-33672 being exploited?

CVE-2026-33672 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-2026-33672 affect?

CVE-2026-33672 affects picomatch. Severity is medium (CVSS 5.3). 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`, spe

How urgent is CVE-2026-33672?

Priority 33/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-33671 HIGH 7.5 UPGRADE Picomatch is a glob matcher written JavaScript

References

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