CVE-2026-39457
highpriority · track · 0EPSS 0.002 · 4 %ileDEEURUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (29)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-1324FreeBSD Project FreeBSD OS: Mehrere SchwachstellenDeutsch2026-04-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in FreeBSD Project FreeBSD OS ausnutzen, um sich erweiterte Rechte, einschließlich Superuser-Rechte, zu verschaffen, beliebigen Code auszuführen – auch mit Administratorrechten –, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand herbeizuführen.
also known as (4)
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sources
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references (4)
External citations — patches, advisories, analysis.
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