Detections
Analytics

SCA: security update for locutus (GHSA-4mph-v827-f877)

medium Tenable Cloud Security Plugin ID 439350

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-33993)

Solution

Update the locutus library and its related packages to version 3.0.25 or later.

See Also

https://github.com/advisories/GHSA-4mph-v827-f877

Plugin Details

Severity: Medium

ID: 439350

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 3/27/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.88

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-33993

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.5

Threat Vector: CVSS:4.0/E:P

Vector: 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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/27/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-33993