CVE•Published 2026-02-04•Modified 2026-07-15•1 article on news•6 live references•NVD data
CVE-2026-25521Locutus · Locutus
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
18
Exploit Prediction Scoring System · top 82% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-02-04
Modified 2026-07-15
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-25521Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Locutus Locutus"All exposed Locutus Locutus instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Locutus"HTTP body or banner mentions "Locutus" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-25521Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-25521Censys host search filtered to this CVE id.
grep.app
CVE-2026-25521Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-25521GitHub code search for direct mentions.
Google dork
"CVE-2026-25521" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-25521 on GitHub.