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{"bugzilla": {"description": "cryptography: python: Cryptography: Security bypass due to improper DNS name constraint validation", "id": "2453276", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453276"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["A flaw was found in the `cryptography` library. This vulnerability occurs because DNS (Domain Name System) name constraints were not properly validated against the \"peer name\" during certificate validation, only against Subject Alternative Names (SANs) within child certificates. This oversight could allow a malicious actor to bypass security restrictions, enabling a certificate for a specific domain to be validated against a broader wildcard certificate, even when an exclusion for that specific domain exists. This could lead to an attacker impersonating a legitimate server or service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34073", "package_state": [{"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-ocp-rag-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": 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Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/foreman-mcp-server-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-advisor-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-host-inventory-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vmaas-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Fix deferred", "package_name": "rhtas/model-transparency-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-03-31T02:04:36Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34073\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34073\nhttps://github.com/pyca/cryptography/security/advisories/GHSA-m959-cc7f-wv43"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,46.0.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cryptography", "source": "cna", "vendor": "pyca"}, "product": "cryptography", "vendor": "pyca"}], "analysis": {"en": {"generated_at": "2026-03-31T05:21:39.923774+00:00", "value": {"mitigation_remediation": ["Upgrade to cryptography 46.0.6 or later"], "summary": {"action": "Apply Patch", "impact": "DNS Name Validation Bypass"}, "threat_synthesis": {"affected_systems": "Versions of pyca:cryptography prior to 46.0.6 are affected. Any Python application that relies on this library for TLS or certificate validation may accept invalid certificates if the peer name is not properly constrained.", "description_and_impact": "The Python cryptography library validates peer names against wildcard certificates even when the certificate chain contains excluded subtree DNS constraints. Because only SANs inside child certificates were checked, an attacker could present a certificate chain for a domain such as bar.example.com that matches a wildcard leaf certificate *.example.com and bypass the intended restriction, enabling certificate misuse. This flaw maps to a weakness in DNS name constraint enforcement (CWE\u2011295).", "risk_and_exploitability": "The CVSS score of 1.7 indicates low severity and there is no EPSS data. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is that an attacker can supply a crafted certificate chain to an application using cryptography, causing it to trust a certificate for a domain it should reject. This could lead to impersonation or man\u2011in\u2011the\u2011middle attacks if the application uses this validation for secure connections."}}}}, "created": "2026-03-31T19:56:21.273743+00:00", "updated": "2026-03-31T20:39:33.494776+00:00", "vendors": ["pyca", "pyca$PRODUCT$cryptography"]}