CVE-2026-89102

CVE Enrichment

CVSS: 8.3 HIGH
EPSS: 0.18%
EPSS Percentile: 6.40%
CISA KEV: Not listed

Description

In wolfSSL versions 5.7.2 through 5.9.2 there is a client-side implementation flaw in RFC 6961, multiple OCSP response stapling, which can lead to certificate forgery. When a wolfSSL client enables OCSP stapling with the HAVE_CERTIFICATE_STATUS_REQUEST_V2 feature and calls wolfSSL_UseOCSPStaplingV2(ssl, WOLFSSL_CSR2_OCSP_MULTI, options), the client accepts any certificate in the peer's chain as a certificate authority without verifying that the certificate is actually authorized to act as one. This means that an attacker who possesses any certificate that chains to a CA trusted by the client (along with its private key) can forge certificates for arbitrary identities that will be accepted as valid by the client. The end entity certificate of the server is stored in the persistent trust store, affecting subsequent connections that reuse the context even when OCSP multi usage is not employed. Found by internal wolfSSL testing.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: facts@wolfssl.com
Published: 27-Sep-2026 17:16
Last Modified: 01-Oct-2026 00:30
EPSS Date: 2026-10-11
CWE: CWE-295

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 /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

Affected Products / Versions

wolfssl / wolfssl
Version / affected range: * · from (inclusive) 5.7.2 · through (inclusive) 5.9.2
cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

References

facts@wolfssl.com

Last enrichment sync: 12-Oct-2026 05:54
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-86131 (WatchGuard), GHSA-cpc9-c4h3-2jwx (geoserver/geoserver-cloud), CVE-2026-93302, CVE-2026-89102 (WolfSSL), CVE-2026-84782 (OpenSSL), CVE-2026-12530, CVE-2026-16796 (Amazon Bedrock AgentCore Python Weekly Security Recap: Exploited Citrix NetScaler Flaw and Dozens of Vulnerabilities

CVE (135)

Vendors (1)

Products (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.