wolfSSL up to 5.8.3 CertificateVerify Message security check

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in wolfSSL up to 5.8.3. It has been classified as problematic. Impacted is an unknown function of the component CertificateVerify Message Handler. Performing a manipulation results in security check. This vulnerability is identified as CVE-2026-2645. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in wolfSSL up to 5.8.3. This affects an unknown code block of the component CertificateVerify Message Handler. The manipulation with an unknown input leads to a security check vulnerability. CWE is classifying the issue as CWE-358. The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique. This is going to have an impact on integrity. The summary by CVE is:

In wolfSSL 5.8.2 and earlier, a logic flaw existed in the TLS 1.2 server state machine implementation. The server could incorrectly accept the CertificateVerify message before the ClientKeyExchange message had been received. This issue affects wolfSSL before 5.8.4 (wolfSSL 5.8.2 and earlier is vulnerable, 5.8.4 is not vulnerable). In 5.8.4 wolfSSL would detect the issue later in the handshake. 5.9.0 was further hardened to catch the issue earlier in the handshake.

The weakness was released by Kai Tian. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-2645 since 02/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1211 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 303243 (Linux Distros Unpatched Vulnerability : CVE-2026-2645), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.8.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303243) and EUVD (EUVD-2026-13135). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

License

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: 5.9
VulDB Meta Temp Score: 5.8

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

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Security check
CWE: CWE-358
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303243
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-2645

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: wolfSSL 5.8.4

Timelineinfo

02/17/2026 CVE reserved
03/19/2026 +30 days Advisory disclosed
03/19/2026 +0 days VulDB entry created
05/05/2026 +47 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Researcher: Kai Tian
Status: Confirmed

CVE: CVE-2026-2645 (🔒)
GCVE (CVE): GCVE-0-2026-2645
GCVE (VulDB): GCVE-100-351741
EUVD: 🔒

Entryinfo

Created: 03/19/2026 18:57
Updated: 05/05/2026 17:46
Changes: 03/19/2026 18:57 (67), 03/19/2026 22:00 (1), 03/22/2026 18:50 (2), 03/22/2026 20:43 (2), 03/24/2026 06:34 (1), 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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