Out-of-Bounds Read Vulnerability in WolfSSL Due to Dual-Algorithm CertificateVerify
CVE-2026-5393

6.3MEDIUM

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
9 April 2026

What is CVE-2026-5393?

The vulnerability in wolfSSL arises when processing a dual-algorithm CertificateVerify message, which can lead to an out-of-bounds read under specific configurations. This occurs when the library is built with the experimental options --enable-experimental and --enable-dual-alg-certs, allowing crafted input to exploit this flaw. The improper handling of input can potentially lead to unexpected behavior or leaks of sensitive information, making it imperative for users to apply appropriate mitigations and check their configurations.

Affected Version(s)

wolfSSL 0 < 5.9.1

References

https://github.com/wolfSSL/wolfssl/pull/10079

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sunwoo Lee, (Korea Institute of Energy Technology, KENTECH) for testing
Woohyun Choi, (Korea Institute of Energy Technology, KENTECH) for testing
Seunghyun Yoon, (Korea Institute of Energy Technology, KENTECH) for testing
.