Low 3.3Published Mar 1, 2026

CVE-2026-3407YosysHQ yosys BLIF File rtlil.h set heap-based overflow

Updated under an hour ago (Oct 27, 2026, 3:40 AM ET)

Does this affect you?

It affects YosysHQ yosys. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for YosysHQ yosys

Exploited in the last 30 days

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.

CVSS: 3.3 LOW (v3.1, CNA)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
Weakness (CWE): CWE-122, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Mar 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

YosysHQ yosys yosyshq:yosys (from the name)	0.1; 0.2; 0.3; 0.4; 0.5; 0.6; 0.7; 0.8; and 54 more ranges	CNA record

References

References

https://vuldb.com/?id.348302	vdb-entry, technical-description
https://vuldb.com/?ctiid.348302	signature, permissions-required
https://vuldb.com/?submit.763755	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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.