EUVD-2026-95092
GHSA-vf9w-2hh8-xxhh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Crafted CA cert is processed over the network during TLS validation with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is availability-only connection denial, so C:N/I:N/A:H and scope unchanged.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
An issue in the ConfirmNameConstraints() function (wolfcrypt/src/asn.c) of wolfSSL v5.9.1 and v5.9.2 allows attackers to cause a Denial of Service (DoS) via providing crafted Certificate Authority certificates, leading to valid certificates without SAN to be incorrectly rejected by wolfSSL-based TLS clients.
AnalysisAI
Denial of service in wolfSSL 5.9.1 and 5.9.2 allows remote, unauthenticated attackers to cause wolfSSL-based TLS clients to incorrectly reject valid server certificates that lack a Subject Alternative Name (SAN) extension by supplying crafted Certificate Authority certificates during the handshake. The vulnerability resides in the ConfirmNameConstraints() function in wolfcrypt/src/asn.c and affects only client-side certificate validation; patched or other versions are not impacted. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a wolfSSL-based TLS client running version 5.9.1 or 5.9.2 process an attacker-supplied, crafted Certificate Authority certificate (e.g., delivered in the certificate chain during a handshake) that drives the defective name-constraints logic in ConfirmNameConstraints() (wolfcrypt/src/asn.c); the impact specifically manifests when the client then validates a legitimate leaf certificate that lacks a Subject Alternative Name (SAN) extension, which is wrongly rejected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The input CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base 7.5) scopes this as a network-reachable, unauthenticated availability-only issue with no confidentiality or integrity impact (CWE-295, improper certificate validation). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all software and devices embedding wolfSSL 5.9.1 or 5.9.2, including commercial off-the-shelf products, embedded firmware, and open-source dependencies identified through SBOMs or binary scanning, and notify application owners that no vendor-released patch is available at time of analysis. …
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Same weakness CWE-295 – Improper Certificate Validation
View allSame technique Denial Of Service
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External POC / Exploit Code
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