wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted certificates for hostnames they shouldn't be allowed to cover, due to a chain-walking state-machine bug that resets the validation state when encountering an intermediate without NameConstraints, thereby bypassing cryptographic delegation controls. This defect exists in the default build configuration that makes use of certificates where name constraint extensions are used. Thanks to Jack Lloyd, PathDiff, and Ben Smyth for reporting the issue.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| wolfSSL | wolfSSL | unaffected |
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Fixes
Solution
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Workaround
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References
| Link | Providers |
|---|---|
| https://github.com/wolfSSL/wolfssl/pull/10687 |
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History
Sun, 27 Sep 2026 09:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted certificates for hostnames they shouldn't be allowed to cover, due to a chain-walking state-machine bug that resets the validation state when encountering an intermediate without NameConstraints, thereby bypassing cryptographic delegation controls. This defect exists in the default build configuration that makes use of certificates where name constraint extensions are used. Thanks to Jack Lloyd, PathDiff, and Ben Smyth for reporting the issue. | |
| Title | NameConstraints not enforced across unconstrained intermediate CA | |
| Weaknesses | CWE-295 | |
| References |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: wolfSSL
Published:
Updated: 2026-09-27T09:18:43.843Z
Reserved: 2026-09-10T22:36:42.599Z
Link: CVE-2026-89133
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses