Vulnerability · Published Mar 2, 2026 · Assigned by VulDB
CVE-2026-3407YosysHQ yosys BLIF File rtlil.h set heap-based overflow
Low 3.3
In plain English
A low-severity heap buffer overflow in yosys from YosysHQ. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
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.
Affected products (as reported)
Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
References
- VDB-348302 | YosysHQ yosys BLIF File rtlil.h set heap-based overflow vdb-entry, technical-description
- VDB-348302 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #763755 | YosysHQ yosys 8bbde80 Heap-based Buffer Overflow third-party-advisory
- https://github.com/YosysHQ/yosys/issues/5677 issue-tracking
- https://github.com/YosysHQ/yosys/pull/5680 issue-tracking, patch
- https://github.com/oneafter/0210/blob/main/yo2/repro exploit
- https://github.com/YosysHQ/yosys/pull/5681 issue-tracking, patch
- https://github.com/YosysHQ/yosys/ product