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Vulnerabilities

Vulnerability · CVE-2026-33993

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-2026-33993. EPSS is 0.75%. 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
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.75%
Remediation
Advisory link
Affected products
cpe locutus/locutus

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the function in assigns deserialized keys to plain objects via bracket notation without filtering the key. When a PHP serialized payload contains as an array or object key, JavaScript's setter is invoked, replacing the deserialized object's prototype with attacker-controlled content. This enables property injection, for...in propagation of injected properties, and denial of service via built-in method override. This is distinct from the previously reported prototype pollution in (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) — is a different function with no mitigation applied. Version 3.0.25 patches the issue.

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-2026-33993

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-2026-33993. EPSS is 0.75%. 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 0.75%. 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.

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. Prior to version 3.0.25, the function in assigns deserialized keys to plain objects via bracket notation without filtering the key. When a PHP serialized payload contains as an array or object key, JavaScript's setter is invoked, replacing the deserialized object's prototype with attacker-controlled conte

  2. Jun 17, 2026 · NIST NVD

    Updated

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the function in assigns deserialized keys to plain objects via bracket notation without filtering the key. When a PHP serialized payload contains as an array or object key, JavaScript's setter is invoked, replacing the deserialized object's prototype with attacker-controlled conte

Sources

  • CVE.orgVulnerability recordCVE-2026-33993

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33993

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33993

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the function in assigns deserialized keys to plain objects via bracket notation without filtering the k

    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.