CVE-2026-4159 - Vulnerability Details - OpenCVE

ReportizFlow

1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements Present

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

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Wolfssl	Wolfssl

No data.

No data.

References

Link	Providers
https://github.com/wolfSSL/wolfssl/pull/9945

History

Fri, 20 Mar 2026 17:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 20 Mar 2026 09:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Wolfssl Wolfssl wolfssl
Vendors & Products		Wolfssl Wolfssl wolfssl

Thu, 19 Mar 2026 21:30:00 +0000

Type	Values Removed	Values Added
Description		1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.
Title		wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read
Weaknesses		CWE-125
References		https://github.com/wolfSSL/wolfssl/pull/9945
Metrics		cvssV4_0 `{'score': 1.2, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green'}`

MITRE

Status: PUBLISHED

Assigner: wolfSSL

Published: 2026-03-19T21:17:46.357Z

Updated: 2026-03-20T16:29:05.925Z

Reserved: 2026-03-13T20:37:44.765Z

Link: CVE-2026-4159

Vulnrichment

Updated: 2026-03-20T16:29:01.336Z

NVD

Status : Awaiting Analysis

Published: 2026-03-19T22:16:42.993

Modified: 2026-03-20T13:37:50.737

Link: CVE-2026-4159

Redhat

No data.

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