CVE-2026-33993

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Source
https://cve.org/CVERecord?id=CVE-2026-33993
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33993.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33993
Aliases
Published
2026-03-27T22:14:03Z
Modified
2026-10-21T02:30:46Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Locutus has Prototype Pollution via __proto__ Key Injection in unserialize()
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1321"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33993.json"
}
References

Affected packages

Git / github.com/locutusjs/locutus

Affected ranges

Type
GIT
Repo
https://github.com/locutusjs/locutus
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0d2402bdb92f9c59918114af9c8ba628f22e9152
Fixed
345a6211e1e6f939f96a7090bfeff642c9fcf9e4
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:locutus:locutus:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.0.25"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "345a6211e1e6f939f96a7090bfeff642c9fcf9e4"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v3.0.25",
            "range":  [
                {
                    "fixed":  "0d2402bdb92f9c59918114af9c8ba628f22e9152"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*
v1.3.2
v2.*
v2.0.0
v2.0.1
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.14
v2.0.15
v2.0.16
v2.0.17
v2.0.19
v2.0.2
v2.0.20
v2.0.21
v2.0.22
v2.0.23
v2.0.24
v2.0.25
v2.0.26
v2.0.27
v2.0.28
v2.0.29
v2.0.3
v2.0.30
v2.0.32
v2.0.33
v2.0.34
v2.0.35
v2.0.36
v2.0.37
v2.0.38
v2.0.39
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v3.*
v3.0.0
v3.0.1
v3.0.10
v3.0.11
v3.0.12
v3.0.13
v3.0.14
v3.0.15
v3.0.16
v3.0.17
v3.0.18
v3.0.19
v3.0.2
v3.0.20
v3.0.21
v3.0.22
v3.0.23
v3.0.24
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.0.7
v3.0.8
v3.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33993.json"