wolfSSL up to 5.9.0 src/internal.c buffer over-read

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.14

Summaryinfo

A vulnerability classified as problematic was found in wolfSSL up to 5.9.0. Affected is an unknown function of the file src/internal.c. Such manipulation leads to buffer over-read. This vulnerability is uniquely identified as CVE-2026-5772. The attack can be launched remotely. No exploit exists. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in wolfSSL up to 5.9.0. Affected by this issue is an unknown function of the file src/internal.c. The manipulation with an unknown input leads to a buffer over-read vulnerability. Using CWE to declare the problem leads to CWE-126. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer. Impacted is availability. CVE summarizes:

A 1-byte stack buffer over-read was identified in the MatchDomainName function (src/internal.c) during wildcard hostname validation when the LEFT_MOST_WILDCARD_ONLY flag is active. If a wildcard * exhausts the entire hostname string, the function reads one byte past the buffer without a bounds check, which could cause a crash.

The weakness was disclosed by Zou Dikai. The advisory is available at github.com. This vulnerability is handled as CVE-2026-5772 since 04/08/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 305900 (Linux Distros Unpatched Vulnerability : CVE-2026-5772), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (305900). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Version

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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: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Buffer over-read
CWE: CWE-126 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305900
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-5772

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: github.com

Timelineinfo

04/08/2026 CVE reserved
04/10/2026 +2 days Advisory disclosed
04/10/2026 +0 days VulDB entry created
04/11/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Researcher: Zou Dikai
Status: Confirmed

CVE: CVE-2026-5772 (🔒)
GCVE (CVE): GCVE-0-2026-5772
GCVE (VulDB): GCVE-100-356762

Entryinfo

Created: 04/10/2026 06:47
Updated: 04/11/2026 01:12
Changes: 04/10/2026 06:47 (66), 04/11/2026 01:12 (2)
Complete: 🔍
Cache ID: 216:5BE:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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