What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-02 · updated 2026-06-17
• Weakness: CWE-119

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

• YosysHQ yosys: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 (+56)

References

• https://github.com/YosysHQ/yosys/
• https://github.com/YosysHQ/yosys/issues/5677
• https://github.com/YosysHQ/yosys/pull/5680
• https://github.com/YosysHQ/yosys/pull/5681
• https://github.com/oneafter/0210/blob/main/yo2/repro
• https://vuldb.com/?ctiid.348302
• https://vuldb.com/?id.348302
• https://vuldb.com/?submit.763755

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