Do Son 
TL;DR
Developers patched six high-severity wolfSSL security vulnerabilities in the embedded SSL library. These flaws include an X.509 trust-chain bypass and dangerous heap buffer overflows. Administrators must update affected systems immediately to prevent remote code execution or denial of service.
Why It Matters
wolfSSL provides essential cryptography for resource-constrained IoT devices worldwide. An attacker exploiting these flaws can compromise secure communications. They can also crash vital hardware. A successful attack on these embedded devices leaves entire networks exposed to data theft or systemic disruption.
How the Attack Works
The first issue, CVE-2026-11310, affects the OpenSSL compatibility certificate verifier. The system temporarily loads untrusted intermediate certificates into the certificate manager. However, it fails to drop them before the trusted-store check. Consequently, an attacker can present a fake chain that anchors the path itself.
Similarly, CVE-2026-11999 causes path-depth exhaustion in the X.509 verifier. The verifier returns success based only on the last verified link. It accepts the chain when it runs out of depth while walking untrusted intermediates. It does this without ever reaching a configured trust anchor.
Another critical flaw, CVE-2026-6679, involves a dangerous heap buffer overflow. This occurs in the DTLS 1.3 ACK serialization path before peer authentication. An integer truncation calculates the wrong length for the record-number list. This allocates an undersized buffer, which the system subsequently overruns.
Meanwhile, CVE-2026-55958 creates an out-of-bounds write in the Renesas TSIP TLS 1.3 transcript buffer. The code sets an error but falls through to a memory copy function. Next, CVE-2026-55960 allows an un-negotiated Raw Public Key to bypass X.509 validation entirely. Finally, CVE-2026-55961 tricks the PKCS#7 verifier into returning success for a degenerate object containing empty signer infos.
Exploitation Status
Currently, cybersecurity researchers have not observed active exploitation of these wolfSSL security vulnerabilities in the wild. Furthermore, public proof-of-concept exploit code does not currently exist for these specific flaws.
Affected Versions
These software bugs impact various library versions depending on the enabled features. Most of these flaws affect versions 5.9.0 and earlier. The OpenSSL compatibility flaws specifically affect versions 5.7.4 through 5.9.1. The Renesas issue only impacts builds with TSIP hardware enabled as a TLS 1.3 client.
Patch and Mitigation Steps
Developers fixed the X.509 trust-chain bypass issues in the 5.9.2 release. They addressed the DTLS 1.3 buffer overflow earlier in version 5.9.1. Administrators should compile their software against the newest release immediately. Users should review the official wolfSSL security advisories to determine their specific upgrade requirements. You can also inspect the detailed commit history and specific pull requests via the project’s ChangeLog.
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