CVE-2026-51539 Denial of service in n/a
A denial of service vulnerability in libmodbus on Windows allows attackers to disrupt service via improper timeout management in the receive loop.
- 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-2026-51539?
CVE-2026-51539 is a high-severity denial of service vulnerability in n/a, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Denial of Service (DoS) vulnerability exists in the receive loop of libmodbus 3.1.12 when running on Windows. The issue stems from improper timeout management during network read operations.
Weakness: CWE-400
Which versions are affected by CVE-2026-51539?
How do I fix CVE-2026-51539?
No fix has been published for CVE-2026-51539 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-51539 being exploited?
There is no known exploitation of CVE-2026-51539 in the wild and no public exploit code.
Sources
Also known as GHSA-4fx8-wmg3-693v.