Locutus is vulnerable to Prototype Pollution
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.4epss 0.3%
exploitation probability
0.3%top 79% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Affected products
locutusjs · locutusReferences
https://access.redhat.com/security/cve/CVE-2026-25521https://bugzilla.redhat.com/show_bug.cgi?id=2436950https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01chttps://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mhhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25521.json