CVE-2026-40701

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With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. 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Esta vulnerabilidad puede resultar en una modificaci\u00f3n limitada de datos o el reinicio del proceso de trabajador de NGINX.\n\nNota: Las versiones de software que han alcanzado el Fin de Soporte T\u00e9cnico (EoTS) no se eval\u00faan."}], "id": "CVE-2026-40701", "lastModified": "2026-10-26T17:10:03.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 2.5, "source": "f5sirt@f5.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "f5sirt@f5.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40701", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-13T15:55:34.604451Z", "version": "2.0.3"}}]}, "published": "2026-05-13T16:16:43.863", "references": [{"source": "f5sirt@f5.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://my.f5.com/manage/s/article/K000161021"}], "sourceIdentifier": "f5sirt@f5.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "f5sirt@f5.com", "type": "Secondary"}]}

{"bugzilla": {"description": "nginx: ngx_http_ssl_module: data corruption and denial of service", "id": "2477076", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477076"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-416", "details": ["A flaw was found in the ngx_http_ssl_module module of NGINX. When the ssl_verify_client directive is set to \"on\" or \"optional\" and the ssl_ocsp directive is enabled or its leaf parameters are configured with a resolver, an unauthenticated attacker can send crafted requests to cause a use-after-free issue in the worker process, resulting in a limited modification of memory data or a denial of service by forcing the process to restart."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, specifically set the OCSP responder using the ssl_ocsp_responder directive or switch from live OCSP validation to static CRL files using the ssl_crl directive. If neither configuration is possible, using a local DNS server to cache and quickly resolve OCSP responder names can reduce the probability of exploitation."}, "name": "CVE-2026-40701", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx:1.26/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nginx", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:insights_proxy:1", "fix_state": "Fix deferred", "package_name": "insights-proxy/insights-proxy-container-rhel9", "product_name": "Red Hat Lightspeed proxy 1"}], "public_date": "2026-05-13T14:12:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-40701\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-40701\nhttps://my.f5.com/manage/s/article/K000161021"], "statement": "To exploit this flaw, the ssl_verify_client directive must be set to \"on\" or \"optional\" and the ssl_ocsp directive must be enabled or its leaf parameters configured with a resolver, limiting its exposure as this is not the default configuration. This issue allows an attacker to have limited control to modify memory data from the worker process or cause a denial of service by forcing the process to restart, but it cannot cause a complete system denial of service. Due to these reasons, this flaw has been rated with a moderate severity.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.19.0,1.30.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[1.31.0,*)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Open Source", "source": "cna", "vendor": "F5"}, "product": "nginx_open_source", "vendor": "f5"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R36,R36 P4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R32,R32 P6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[R37,*)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Plus", "source": "cna", "vendor": "F5"}, "product": "nginx_plus", "vendor": "f5"}], "created": "2026-05-13T16:45:44.956173+00:00", "updated": "2026-05-13T18:00:05.550544+00:00", "vendors": ["f5", "f5$PRODUCT$nginx_open_source", "f5$PRODUCT$nginx_plus"]}