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

Quick assessment

Affected
wolfSSL wolfSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在使用 RPK（原始公钥）时，TLS 1.2、1.3 以及 DTLS 1.2 连接的客户端可能接受未经请求的 server_cert_type=RawPublicKey，从而允许恶意或行为不端的服务器绕过身份验证。RPK 默认处于关闭状态，仅在启用 --enable-rpk、--enable-all 或 --enable-distro（即 HAVE_RPK 构建）时才会启用。

CVSS 8.3 · High EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1078.001 · Default Accounts
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I. Basic Information for CVE-2026-89136

Vulnerability Information
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Vulnerability Title
Client accepts unsolicited RawPublicKey server certificate type
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 5.6.0 ~ 5.9.2 -

II. Public POCs for CVE-2026-89136

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III. Intelligence Information for CVE-2026-89136

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Other References for CVE-2026-89136 (1)

Same Patch Batch · wolfSSL · 2026-09-27 · 11 CVEs total

CVE-2026-93302 8.3 HIGH Trusted peer certificate match ignores public key, allowing forged CA clones
CVE-2026-89102 8.3 HIGH OCSP stapling v2 multi accepts non-CA chain certificates as issuers
CVE-2026-93304 6.3 MEDIUM (D)TLS 1.2 client accepts early ChangeCipherSpec before ClientKeyExchange
CVE-2026-89133 6.3 MEDIUM NameConstraints not enforced across unconstrained intermediate CA
CVE-2026-89134 6.3 MEDIUM Subject CN name-constraint check bypassed when non-DNS SAN present
CVE-2026-89135 6.3 MEDIUM Failed X509_verify_cert leaves unverified CA in shared CertManager
CVE-2026-15442 2.3 LOW Heap use-after-free on read during bidirectional (D)TLS shutdown
CVE-2026-94418 2.3 LOW Signature failure masked by date error under WOLFSSL_SMALL_CERT_VERIFY
CVE-2026-94419 2.3 LOW Client session cache reference poisoning allows resumption with wrong server
CVE-2026-94417 2.3 LOW CRL check skipped when OCSP enabled and certificate has no OCSP URL

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-287

V. Comments for CVE-2026-89136

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