Vulnerability Details CVE-2026-39457
When exchanging data over a socket, libnv uses select(2) to wait for data to arrive. However, it does not verify whether the provided socket descriptor fits in select(2)'s file descriptor set size limit of FD_SETSIZE (1024).
An attacker who is able to force a libnv application to allocate large file descriptors, e.g., by opening many descriptors and executing a program which is not careful to close them upon startup, can trigger stack corruption. If the target application is setuid-root, then this could be used to elevate local privileges.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.1%
CVSS Severity
CVSS v3 Score 7.8