CVE-2026-89136 Client accepts unsolicited RawPublicKey server certificate type
A malicious server can bypass client authentication in wolfSSL when Raw Public Key support is explicitly enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89136?
CVE-2026-89136 is a high-severity authentication bypass vulnerability in wolfSSL, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds.
Weakness: CWE-287
Which versions are affected by CVE-2026-89136?
How do I fix CVE-2026-89136?
No fix has been published for CVE-2026-89136 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-89136 being exploited?
There is no known exploitation of CVE-2026-89136 in the wild and no public exploit code.
Sources
Also known as AZL-105179, DEBIAN-CVE-2026-89136, GHSA-qqgw-76jp-m5f3, UBUNTU-CVE-2026-89136.