CVE-2026-3407

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

Published Mar 2, 2026 CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

YosysHQ

yosys

affected

Version	Status	Constraints
`0.1`	affected	—
`0.2`	affected	—
`0.3`	affected	—
`0.4`	affected	—
`0.5`	affected	—
`0.6`	affected	—
`0.7`	affected	—
`0.8`	affected	—
`0.9`	affected	—
`0.10`	affected	—
`0.11`	affected	—
`0.12`	affected	—
`0.13`	affected	—
`0.14`	affected	—
`0.15`	affected	—
`0.16`	affected	—
`0.17`	affected	—
`0.18`	affected	—
`0.19`	affected	—
`0.20`	affected	—
`0.21`	affected	—
`0.22`	affected	—
`0.23`	affected	—
`0.24`	affected	—
`0.25`	affected	—
`0.26`	affected	—
`0.27`	affected	—
`0.28`	affected	—
`0.29`	affected	—
`0.30`	affected	—
`0.31`	affected	—
`0.32`	affected	—
`0.33`	affected	—
`0.34`	affected	—
`0.35`	affected	—
`0.36`	affected	—
`0.37`	affected	—
`0.38`	affected	—
`0.39`	affected	—
`0.40`	affected	—
`0.41`	affected	—
`0.42`	affected	—
`0.43`	affected	—
`0.44`	affected	—
`0.45`	affected	—
`0.46`	affected	—
`0.47`	affected	—
`0.48`	affected	—
`0.49`	affected	—
`0.50`	affected	—
`0.51`	affected	—
`0.52`	affected	—
`0.53`	affected	—
`0.54`	affected	—
`0.55`	affected	—
`0.56`	affected	—
`0.57`	affected	—
`0.58`	affected	—
`0.59`	affected	—
`0.60`	affected	—
`0.61`	affected	—
`0.62`	affected	—

No data.

Vendor Product Versions

Yosyshq

Yosys

Version	Status	Scheme	Platform
`0.1`	affected	generic	—
`0.2`	affected	generic	—
`0.3`	affected	generic	—
`0.4`	affected	generic	—
`0.5`	affected	generic	—
`0.6`	affected	generic	—
`0.7`	affected	generic	—
`0.8`	affected	generic	—
`0.9`	affected	generic	—
`0.10`	affected	generic	—
`0.11`	affected	generic	—
`0.12`	affected	generic	—
`0.13`	affected	generic	—
`0.14`	affected	generic	—
`0.15`	affected	generic	—
`0.16`	affected	generic	—
`0.17`	affected	generic	—
`0.18`	affected	generic	—
`0.19`	affected	generic	—
`0.20`	affected	generic	—
`0.21`	affected	generic	—
`0.22`	affected	generic	—
`0.23`	affected	generic	—
`0.24`	affected	generic	—
`0.25`	affected	generic	—
`0.26`	affected	generic	—
`0.27`	affected	generic	—
`0.28`	affected	generic	—
`0.29`	affected	generic	—
`0.30`	affected	generic	—
`0.31`	affected	generic	—
`0.32`	affected	generic	—
`0.33`	affected	generic	—
`0.34`	affected	generic	—
`0.35`	affected	generic	—
`0.36`	affected	generic	—
`0.37`	affected	generic	—
`0.38`	affected	generic	—
`0.39`	affected	generic	—
`0.40`	affected	generic	—
`0.41`	affected	generic	—
`0.42`	affected	generic	—
`0.43`	affected	generic	—
`0.44`	affected	generic	—
`0.45`	affected	generic	—
`0.46`	affected	generic	—
`0.47`	affected	generic	—
`0.48`	affected	generic	—
`0.49`	affected	generic	—
`0.50`	affected	generic	—
`0.51`	affected	generic	—
`0.52`	affected	generic	—
`0.53`	affected	generic	—
`0.54`	affected	generic	—
`0.55`	affected	generic	—
`0.56`	affected	generic	—
`0.57`	affected	generic	—
`0.58`	affected	generic	—
`0.59`	affected	generic	—
`0.60`	affected	generic	—
`0.61`	affected	generic	—
`0.62`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.144% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
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

History

Mar 2, 2026 3:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mar 2, 2026 12:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Yosyshq Yosyshq yosys
Vendors & Products		Yosyshq Yosyshq yosys

Mar 2, 2026 3:15 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		YosysHQ yosys BLIF File rtlil.h set heap-based overflow
Weaknesses		CWE-119 CWE-122
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
Metrics		cvssV2_0 `{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C'}` cvssV3_0 `{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'}` cvssV3_1 `{'score': 3.3, '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'}` cvssV4_0 `{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Yosyshq Yosys

Weaknesses

Sources

CVE record Updated: Mar 2, 2026, 2:43 PM

Status: PUBLISHED
Assigner: VulDB
Published: Mar 2, 2026, 3:02 AM
Updated: Mar 2, 2026, 2:43 PM
Reserved: Mar 1, 2026, 7:03 AM

View source JSON

Vulnrichment Updated: Mar 2, 2026, 2:40 PM

Updated: Mar 2, 2026, 2:40 PM

JSON

NVD Updated: Jun 17, 2026, 10:43 AM

Status: Deferred
Published: Mar 2, 2026, 3:16 AM
Modified: Jun 17, 2026, 10:43 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment Updated: Apr 18, 2026, 10:15 AM

Updated: Apr 18, 2026, 10:15 AM

JSON

Affected Products

Remediation

Tracking

Advisories

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

Sources

JSON object

JSON object

JSON object

JSON object

JSON object