{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40944", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-15T20:40:15.519Z", "datePublished": "2026-04-21T21:14:56.814Z", "dateUpdated": "2026-04-22T13:18:32.925Z"}, "containers": {"cna": {"title": "Oxia: TLS CA certificate chain validation fails with multi-certificate PEM bundles", "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "lang": "en", "description": "CWE-295: Improper Certificate Validation", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/oxia-db/oxia/security/advisories/GHSA-7jrq-q4pq-rhm6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/oxia-db/oxia/security/advisories/GHSA-7jrq-q4pq-rhm6"}], "affected": [{"vendor": "oxia-db", "product": "oxia", "versions": [{"version": "< 0.16.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-21T21:14:56.814Z"}, "descriptions": [{"lang": "en", "value": "Oxia is a metadata store and coordination system. Prior to 0.16.2, the trustedCertPool() function in the TLS configuration only parses the first PEM block from CA certificate files. When a CA bundle contains multiple certificates (e.g., intermediate + root CA), only the first certificate is loaded. This silently breaks certificate chain validation for mTLS. This vulnerability is fixed in 0.16.2."}], "source": {"advisory": "GHSA-7jrq-q4pq-rhm6", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-22T13:18:24.370962Z", "id": "CVE-2026-40944", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-22T13:18:32.925Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.16.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "oxia", "source": "cna", "vendor": "oxia-db"}, "product": "oxia", "vendor": "oxia-db"}], "analysis": {"en": {"generated_at": "2026-04-22T06:21:08.645721+00:00", "value": {"mitigation_remediation": ["Upgrade Oxia to version 0.16.2 or later to include the fixed trustedCertPool() logic.", "Verify that the TLS certificate bundle contains only one PEM block or that multi\u2011certificate bundles are correctly parsed after the upgrade; remove unused certificates if necessary.", "If an upgrade is not immediately possible, decline mTLS traffic until the issue is resolved to prevent service disruption."], "summary": {"action": "Apply Patch", "impact": "Disruption of Mutual TLS Authentication"}, "threat_synthesis": {"affected_systems": "Oxia, a metadata store and coordination system developed by oxia-db, is affected in all releases before version 0.16.2. The vulnerability arises from the TLS configuration when multi\u2011certificate PEM bundles are used.", "description_and_impact": "The vulnerability stems from the trustedCertPool() function in Oxia, which, in versions prior to 0.16.2, only parses the first PEM block of a CA certificate file. When a certificate bundle contains multiple PEM blocks\u2014such as an intermediate and a root certificate\u2014the additional certificates are ignored, causing certificate chain validation to silently fail. This flaw is a certificate validation weakness (CWE-295) that can lead to the failure of mutual TLS authentication for legitimate connections, effectively disabling a critical security mechanism and resulting in a loss of availability for services that rely on mTLS.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a high\u2011moderate severity, and the exploit probability is not available, though the vulnerability is not listed in the CISA KEV catalog. An attacker could exploit this flaw via remote network traffic by presenting a multi\u2011certificate PEM bundle to an Oxia instance; the server would silently reject the chain, causing denial\u2011of\u2011service conditions for mutual TLS\u2011protected endpoints. There is no code execution vector or direct elevation of privileges reported. The risk is primarily associated with availability and authentication failure rather than confidentiality or integrity."}}}}, "created": "2026-04-22T04:45:09.348109+00:00", "updated": "2026-04-22T11:44:59.342400+00:00", "vendors": ["oxia-db", "oxia-db$PRODUCT$oxia"]}