wolfSSL's wolfcrypt library does not enforce URI nameConstraints from constrained intermediate CAs during certificate chain verification. (CVE-2026-5263)
wolfSSL's wolfcrypt library does not enforce URI nameConstraints from constrained intermediate CAs during certificate chain verification. This allows a compromised or malicious sub-CA to issue leaf certificates with URI SAN entries that violate the issuing CA's nameConstraints, which wolfSSL would incorrectly accept as valid.
AI Analysis
Technical Summary
The vulnerability in wolfcrypt/src/asn.c involves parsing but not enforcing URI nameConstraints from constrained intermediate certificate authorities during certificate chain verification. As a result, a malicious or compromised subordinate CA could issue leaf certificates containing URI Subject Alternative Name entries that violate the nameConstraints policy of the issuing CA. wolfSSL would accept such certificates as valid, potentially undermining trust and certificate validation security.
Potential Impact
This vulnerability can lead to acceptance of leaf certificates with unauthorized URI SAN entries, violating the intended nameConstraints policy. This undermines the security model of certificate validation, potentially allowing unauthorized entities to present certificates that should be rejected, thereby impacting trust and security of TLS connections relying on wolfSSL.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Users should monitor wolfSSL advisories for updates addressing this issue.
wolfSSL's wolfcrypt library does not enforce URI nameConstraints from constrained intermediate CAs during certificate chain verification. (CVE-2026-5263)
Description
wolfSSL's wolfcrypt library does not enforce URI nameConstraints from constrained intermediate CAs during certificate chain verification. This allows a compromised or malicious sub-CA to issue leaf certificates with URI SAN entries that violate the issuing CA's nameConstraints, which wolfSSL would incorrectly accept as valid.
CVSS v4.0
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in wolfcrypt/src/asn.c involves parsing but not enforcing URI nameConstraints from constrained intermediate certificate authorities during certificate chain verification. As a result, a malicious or compromised subordinate CA could issue leaf certificates containing URI Subject Alternative Name entries that violate the nameConstraints policy of the issuing CA. wolfSSL would accept such certificates as valid, potentially undermining trust and certificate validation security.
Potential Impact
This vulnerability can lead to acceptance of leaf certificates with unauthorized URI SAN entries, violating the intended nameConstraints policy. This undermines the security model of certificate validation, potentially allowing unauthorized entities to present certificates that should be rejected, thereby impacting trust and security of TLS connections relying on wolfSSL.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Users should monitor wolfSSL advisories for updates addressing this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9xmr-c663-3rpr
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-5263"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a46ecdc27e9c7971943f86c
Added to database: 07/02/2026, 22:57:32 UTC
Last enriched: 07/02/2026, 23:24:08 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 7
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