CVE-2026-93601

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{"bugzilla": {"description": "rustls-webpki: rustls-webpki: Name Constraint Bypass in wildcard certificate validation", "id": "2538656", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538656"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-1289", "details": ["rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com \u2014 a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.", "A flaw was found in rustls-webpki. This component incorrectly processes DNS (Domain Name System) name constraints for certificates asserting a wildcard name. This could allow a misissued wildcard certificate to be accepted for a domain that should be outside its permitted scope. Consequently, this bypass of name constraints could lead to incorrect certificate validation, potentially enabling an attacker to spoof a legitimate domain or perform man-in-the-middle attacks if they can obtain and use such a misissued certificate."], "name": "CVE-2026-93601", "package_state": [{"cpe": "cpe:/a:redhat:confidential_cluster_operator:4", "fix_state": "Fix deferred", "package_name": "confidential-clusters-beta/attestation-key-register-rhel9", "product_name": "Confidential Cluster Operator"}, {"cpe": "cpe:/a:redhat:confidential_cluster_operator:4", "fix_state": "Fix deferred", "package_name": "confidential-clusters-beta/compute-pcrs-rhel9", "product_name": "Confidential Cluster Operator"}, {"cpe": "cpe:/a:redhat:confidential_cluster_operator:4", "fix_state": "Fix deferred", "package_name": "confidential-clusters-beta/confidential-cluster-operator-bundle", "product_name": "Confidential Cluster Operator"}, {"cpe": "cpe:/a:redhat:confidential_cluster_operator:4", "fix_state": 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Signer"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Fix deferred", "package_name": "rhtas/tuftool-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:3", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-rhel10", "product_name": "Red Hat Trusted Profile Analyzer"}], "public_date": "2026-09-18T13:20:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93601\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93601\nhttps://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh\nhttps://www.vulncheck.com/advisories/rustls-webpki-0.101.0-before-0.103.12-name-constraint-bypass"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.101.0,0.103.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.104.0-alpha.1,0.104.0-alpha.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "webpki", "source": "cna", "vendor": "rustls"}, "product": "webpki", "vendor": "rustls"}], "created": "2026-09-19T01:00:09.203214+00:00", "updated": "2026-09-23T01:45:19.227305+00:00", "vendors": ["rustls", "rustls$PRODUCT$webpki"]}