CVE-2026-25521
Locutus is vulnerable to Prototype Pollution
Description
Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.
INFO
Published Date :
Feb. 4, 2026, 10:15 p.m.
Last Modified :
June 27, 2026, 5:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update locutus to version 2.0.39 or later.
- Review and sanitize all user inputs rigorously.
- Avoid directly merging user input into objects.
Public PoC/Exploit Available at Github
CVE-2026-25521 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-25521.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-25521 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-25521
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python JavaScript Shell HTML
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-25521 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-25521 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 27, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:logging:5'], 'vendor': 'Red Hat', 'product': 'Logging Subsystem for Red Hat OpenShift', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-915 Added Reference https://access.redhat.com/security/cve/CVE-2026-25521 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2436950 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25521.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'locutusjs', 'product': 'locutus', 'versions': [{'status': 'affected', 'version': '>= 2.0.12, < 2.0.39'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-25521', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-02-05T14:23:07.184247Z'} -
Initial Analysis by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:locutus:locutus:*:*:*:*:*:node.js:*:* versions from (including) 2.0.12 up to (excluding) 2.0.39 Added Reference Type GitHub, Inc.: https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Feb. 04, 2026
Action Type Old Value New Value Added Description Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-1321 Added Reference https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c Added Reference https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh