CVE-2026-5393 | wolfSSL up to 5.9.0 out-of-bounds

VDB-356776 · CVE-2026-5393 · GCVE-0-2026-5393 WOLFSSL UP TO 5.9.0 OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 1.01+ Summaryinfo A vulnerability classified as problematic was found in wolfSSL up to 5.9.0. This affects an unknown part. Executing a manipulation can lead to out-of-bounds. This vulnerability is handled as CVE-2026-5393. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in wolfSSL up to 5.9.0. It has been declared as critical. This vulnerability affects an unknown function. 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 confidentiality, integrity, and availability. CVE summarizes: Dual-Algorithm CertificateVerify out-of-bounds read. When processing a dual-algorithm CertificateVerify message, an out-of-bounds read can occur on crafted input. This can only occur when --enable-experimental and --enable-dual-alg-certs is used when building wolfSSL. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-5393 since 04/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. Upgrading to version 5.9.1 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. Productinfo Name wolfSSL Version 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9.0 License open-source Website Product: https://github.com/wolfSSL/wolfssl/ 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: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds CWE: CWE-125 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: wolfSSL 5.9.1 Patch: github.com Timelineinfo 04/02/2026 CVE reserved 04/10/2026 +8 days Advisory disclosed 04/10/2026 +0 days VulDB entry created 04/10/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-5393 (🔒) GCVE (CVE): GCVE-0-2026-5393 GCVE (VulDB): GCVE-100-356776 Entryinfo Created: 04/10/2026 06:54 Changes: 04/10/2026 06:54 (66) Complete: 🔍 Cache ID: 99:945:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸