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Vulnerabilities

Vulnerability · CVE-2026-33994

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes.

Published Mar 27, 2026 · catalog updated Jun 17, 2026 · Locutus brings stdlibs of

Check if you run it

No confirmed exploitation is on record for CVE-2026-33994. EPSS is 0.76%. Act only if a listed version of Locutus brings stdlibs of is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Locutus brings stdlibs of).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.76%
Remediation
Advisory link
Affected products
cpe locutus/locutus

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in version 2.0.39 and prior to version 3.0.25, a prototype pollution vulnerability exists in the function of the npm package locutus. An attacker can pollute by overriding and then passing a crafted query string to , bypassing the prototype pollution guard. This vulnerability stems from an incomplete fix for CVE-2026-25521. The CVE-2026-25521 patch replaced the -based guard with a -based guard. However, is itself a writable prototype method that can be overridden, making the new guard bypassable in the same way as the original — trading one hijackable built-in for another. Version 3.0.25 contains an updated fix.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe locutus/locutusversion unspecified

How to fix CVE-2026-33994

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33994. EPSS is 0.76%. Act only if a listed version of Locutus brings stdlibs of is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). EPSS 0.76%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in version 2.0.39 and prior to version 3.0.25, a prototype pollution vulnerability exists in the function of the npm package locutus. An attacker can pollute by overriding and then passing a crafted query string to , bypassing the prototype pollution guard. This vulnerability stems from an incomp

  2. Jun 17, 2026 · NIST NVD

    Updated

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in version 2.0.39 and prior to version 3.0.25, a prototype pollution vulnerability exists in the function of the npm package locutus. An attacker can pollute by overriding and then passing a crafted query string to , bypassing the prototype pollution guard. This vulnerability stems from an incomp

Sources

  • CVE.orgVulnerability recordCVE-2026-33994

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33994

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33994

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in version 2.0.39 and prior to version 3.0.25, a prototype pollution vulnerability exists in the function of the npm package locutus. An attacker can pollute `Object

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.