wolfSSL up to 5.8.x CMS EnvelopedData Message wc_PKCS7_DecodeEnvelopedData out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in wolfSSL up to 5.8.x. This impacts the function wc_PKCS7_DecodeEnvelopedData of the component CMS EnvelopedData Message Handler. This manipulation causes out-of-bounds. This vulnerability is tracked as CVE-2026-4159. The attack is restricted to local execution. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in wolfSSL up to 5.8.x and classified as problematic. Affected by this vulnerability is the function wc_PKCS7_DecodeEnvelopedData of the component CMS EnvelopedData Message Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is:

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.

The weakness was disclosed by Haruto Kimura. The advisory is shared at github.com. This vulnerability is known as CVE-2026-4159 since 03/13/2026. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 303178 (Linux Distros Unpatched Vulnerability : CVE-2026-4159), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.9.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (303178). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 4.0
VulDB Temp Score: 3.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303178
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4159

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: wolfSSL 5.9.0
Patch: github.com

Timelineinfo

03/13/2026 CVE reserved
03/20/2026 +7 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
05/05/2026 +46 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Researcher: Haruto Kimura
Status: Confirmed

CVE: CVE-2026-4159 (🔒)
GCVE (CVE): GCVE-0-2026-4159
GCVE (VulDB): GCVE-100-351877

Entryinfo

Created: 03/20/2026 07:47
Updated: 05/05/2026 17:46
Changes: 03/20/2026 07:47 (70), 03/22/2026 21:58 (2), 03/23/2026 16:50 (2), 05/05/2026 17:46 (11)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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