CVE-2026-89136 PUBLISHED

Client accepts unsolicited RawPublicKey server certificate type

Assigner: wolfSSL
Reserved: 10.09.2026 Published: 27.09.2026 Updated: 27.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 8.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 5.6.0 to 5.9.2 (incl.)

Credits

Christos Papakonstantinou (Cantina Security) finder

References

https://github.com/wolfSSL/wolfssl/pull/11009

Problem Types

CWE-287 Improper Authentication CWE