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Vulnerable Software

Vulnerability Details CVE-2026-33993

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the `unserialize()` function in `locutus/php/var/unserialize` assigns deserialized keys to plain objects via bracket notation without filtering the `__proto__` key. When a PHP serialized payload contains `__proto__` as an array or object key, JavaScript's `__proto__` 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 `parse_str` (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) — `unserialize` is a different function with no mitigation applied. Version 3.0.25 patches the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.2%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-33993
  • Locutus » Locutus » Version: N/A
    cpe:2.3:a:locutus:locutus:-
  • Locutus » Locutus » Version: 1.3.2
    cpe:2.3:a:locutus:locutus:1.3.2
  • Locutus » Locutus » Version: 2.0.0
    cpe:2.3:a:locutus:locutus:2.0.0
  • Locutus » Locutus » Version: 2.0.1
    cpe:2.3:a:locutus:locutus:2.0.1
  • Locutus » Locutus » Version: 2.0.10
    cpe:2.3:a:locutus:locutus:2.0.10
  • Locutus » Locutus » Version: 2.0.11
    cpe:2.3:a:locutus:locutus:2.0.11
  • Locutus » Locutus » Version: 2.0.12
    cpe:2.3:a:locutus:locutus:2.0.12
  • Locutus » Locutus » Version: 2.0.13
    cpe:2.3:a:locutus:locutus:2.0.13
  • Locutus » Locutus » Version: 2.0.14
    cpe:2.3:a:locutus:locutus:2.0.14
  • Locutus » Locutus » Version: 2.0.15
    cpe:2.3:a:locutus:locutus:2.0.15
  • Locutus » Locutus » Version: 2.0.16
    cpe:2.3:a:locutus:locutus:2.0.16
  • Locutus » Locutus » Version: 2.0.17
    cpe:2.3:a:locutus:locutus:2.0.17
  • Locutus » Locutus » Version: 2.0.19
    cpe:2.3:a:locutus:locutus:2.0.19
  • Locutus » Locutus » Version: 2.0.2
    cpe:2.3:a:locutus:locutus:2.0.2
  • Locutus » Locutus » Version: 2.0.20
    cpe:2.3:a:locutus:locutus:2.0.20
  • Locutus » Locutus » Version: 2.0.21
    cpe:2.3:a:locutus:locutus:2.0.21
  • Locutus » Locutus » Version: 2.0.22
    cpe:2.3:a:locutus:locutus:2.0.22
  • Locutus » Locutus » Version: 2.0.23
    cpe:2.3:a:locutus:locutus:2.0.23
  • Locutus » Locutus » Version: 2.0.24
    cpe:2.3:a:locutus:locutus:2.0.24
  • Locutus » Locutus » Version: 2.0.25
    cpe:2.3:a:locutus:locutus:2.0.25
  • Locutus » Locutus » Version: 2.0.26
    cpe:2.3:a:locutus:locutus:2.0.26
  • Locutus » Locutus » Version: 2.0.27
    cpe:2.3:a:locutus:locutus:2.0.27
  • Locutus » Locutus » Version: 2.0.28
    cpe:2.3:a:locutus:locutus:2.0.28
  • Locutus » Locutus » Version: 2.0.29
    cpe:2.3:a:locutus:locutus:2.0.29
  • Locutus » Locutus » Version: 2.0.3
    cpe:2.3:a:locutus:locutus:2.0.3
  • Locutus » Locutus » Version: 2.0.30
    cpe:2.3:a:locutus:locutus:2.0.30
  • Locutus » Locutus » Version: 2.0.31
    cpe:2.3:a:locutus:locutus:2.0.31
  • Locutus » Locutus » Version: 2.0.32
    cpe:2.3:a:locutus:locutus:2.0.32
  • Locutus » Locutus » Version: 2.0.33
    cpe:2.3:a:locutus:locutus:2.0.33
  • Locutus » Locutus » Version: 2.0.34
    cpe:2.3:a:locutus:locutus:2.0.34
  • Locutus » Locutus » Version: 2.0.35
    cpe:2.3:a:locutus:locutus:2.0.35
  • Locutus » Locutus » Version: 2.0.36
    cpe:2.3:a:locutus:locutus:2.0.36
  • Locutus » Locutus » Version: 2.0.37
    cpe:2.3:a:locutus:locutus:2.0.37
  • Locutus » Locutus » Version: 2.0.38
    cpe:2.3:a:locutus:locutus:2.0.38
  • Locutus » Locutus » Version: 2.0.39
    cpe:2.3:a:locutus:locutus:2.0.39
  • Locutus » Locutus » Version: 2.0.4
    cpe:2.3:a:locutus:locutus:2.0.4
  • Locutus » Locutus » Version: 2.0.5
    cpe:2.3:a:locutus:locutus:2.0.5
  • Locutus » Locutus » Version: 2.0.6
    cpe:2.3:a:locutus:locutus:2.0.6
  • Locutus » Locutus » Version: 2.0.7
    cpe:2.3:a:locutus:locutus:2.0.7
  • Locutus » Locutus » Version: 2.0.8
    cpe:2.3:a:locutus:locutus:2.0.8
  • Locutus » Locutus » Version: 2.0.9
    cpe:2.3:a:locutus:locutus:2.0.9


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