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CVE-2026-89135— Failed X509_verify_cert leaves unverified CA in shared CertManager

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.

一个失败的 调用会在共享的 CertManager 中永久植入一个未经认证的攻击者 CA，从而绕过所有类型无关的 sibling 消费者（原生 TLS、OCSP、CRL、直接 CM 验证）中的证书验证逻辑。此漏洞影响 wolfSSL 5.8.4 至 5.9.2 版本，在定义了宏 或使用了 选项构建，并且应用程序明确调用 函数的情况下存在风险。

CVSS 6.3 · Medium EPSS 0.21% · P10
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I. Basic Information for CVE-2026-89135

Vulnerability Information
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Vulnerability Title
Failed X509_verify_cert leaves unverified CA in shared CertManager
Source: CVE Program / CVE List V5
Vulnerability Description
A failed X509_verify_cert call permanently plants an unverified attacker CA in the shared CertManager, bypassing certificate validation in every type-blind sibling consumer (native TLS, OCSP, CRL, direct CM verify). This affects version 5.8.4 through 5.9.2 of wolfSSL with the macros (OPENSSL_EXTRA && !NO_CERTS && !WOLFCRYPT_ONLY) defined or built with --enable-opensslextra and the application is specifically making calls to the X509_verify_cert function.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 5.8.4 ~ 5.9.2 -

II. Public POCs for CVE-2026-89135

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III. Intelligence Information for CVE-2026-89135

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Other References for CVE-2026-89135 (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-2026-89136 8.3 HIGH Client accepts unsolicited RawPublicKey server certificate type
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-2026-15442 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-295

V. Comments for CVE-2026-89135

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