CVE-2026-3407 - Vulnerability Details

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

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.

Published: 2026-03-02

Score: 4.8 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

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 Confidence Versions

Yosyshq

Yosys

100%

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	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

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.

The EPSS score is 0.00019.

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

Mon, 02 Mar 2026 15:15:00 +0000

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

Mon, 02 Mar 2026 12:15:00 +0000

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

Mon, 02 Mar 2026 03:15:00 +0000

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

MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-03-02T03:02:09.924Z

Updated: 2026-03-02T14:43:12.380Z

Reserved: 2026-03-01T07:03:11.753Z

Link: CVE-2026-3407

Vulnrichment

Updated: 2026-03-02T14:40:30.343Z

NVD

Status : Deferred

Published: 2026-03-02T03:16:01.600

Modified: 2026-04-29T01:00:01.613

Link: CVE-2026-3407

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-04-18T10:15:25Z

Weaknesses

Tracking

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

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