High 8.3Published Sep 27, 2026

CVE-2026-89136Client accepts unsolicited RawPublicKey server certificate type

Updated under an hour ago (2026-10-19 09:30 UTC)

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It affects wolfSSL. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.55%, higher than 44% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.3 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.55% (percentile 44)
Assigned by: wolfSSL
NVD analysis: Awaiting Analysis
Record last updated: Sep 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

wolfSSL wolfSSL wolfssl:wolfssl (from the name)	from 5.6.0 through 5.9.2	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.