CVE-2026-35547 Heap overflow in libnv
A heap overflow in libnv allows unprivileged users to potentially escalate privileges or cause system crashes via malformed message headers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35547?
CVE-2026-35547 is a high-severity memory corruption vulnerability in Freebsd Freebsd, published on 30 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When processing the header of an incoming message, libnv failed to properly validate the message size.
The lack of validation allows a malicious program to write outside the bounds of a heap allocation. This can trigger a crash or system panic, and it may be possible for an unprivileged user to exploit the bug to elevate their privileges.
Which versions are affected by CVE-2026-35547?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-35547?
No fix has been published for CVE-2026-35547 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-35547 being exploited?
There is no known exploitation of CVE-2026-35547 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-wq83-w9r6-h456.