CVE-2026-3407 YosysHQ yosys BLIF File rtlil.h set heap-based overflow
A heap-based buffer overflow in the Yosys BLIF parser allows local attackers to execute arbitrary code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3407?
CVE-2026-3407 is a medium-severity memory corruption vulnerability in YosysHQ yosys, published on 2 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was determined in YosysHQ yosys up to 0.62. This affects the function Yosys::RTLIL::Const::set of the file kernel/rtlil.h of the component BLIF File Parser. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Applying a patch is the recommended action to fix this issue. It appears that the issue is not reproducible all the time.
Which versions are affected by CVE-2026-3407?
How do I fix CVE-2026-3407?
No fix has been published for CVE-2026-3407 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-2026-3407 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3407 exists.
Sources
Also known as GHSA-vc6w-j78g-3gch.