CVE-2026-42934

{"id": "CVE-2026-42934", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42934", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-13T15:55:18.483975Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "f5sirt@f5.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.2}], "cvssMetricV40": [{"type": "Secondary", "source": "f5sirt@f5.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "f5sirt@f5.com", "affectedData": [{"vendor": "F5", "modules": ["ngx_http_charset_module"], "product": "NGINX Plus", "versions": [{"status": "unaffected", "version": "R37", "lessThan": "*", "versionType": "custom"}, {"status": "affected", "version": "R36", "lessThan": "R36 P4", "versionType": "custom"}, {"status": "affected", "version": "R32", "lessThan": "R32 P6", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "F5", "modules": ["ngx_http_charset_module"], "product": "NGINX Open Source", "versions": [{"status": "unaffected", "version": "1.31.0", "lessThan": "*", "versionType": "semver"}, {"status": "affected", "version": "0.3.50", "lessThan": "1.30.1", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-05-13T16:16:49.910", "references": [{"url": "https://my.f5.com/manage/s/article/K000161028", "tags": ["Mitigation", "Vendor Advisory"], "source": "f5sirt@f5.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "f5sirt@f5.com", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map\u00a0and proxy_pass\u00a0with disabled buffering (\"off\") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.\n\n\n\n\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}, {"lang": "es", "value": "NGINX Plus y NGINX Open Source tienen una vulnerabilidad en el m\u00f3dulo ngx_http_charset_module. Cuando las directivas charset, source_charset, charset_map y proxy_pass con el almacenamiento en b\u00fafer deshabilitado (\u2019off\u2019) est\u00e1n configuradas, atacantes no autenticados pueden enviar solicitudes que, con condiciones fuera del control de los atacantes, causen una lectura excesiva del b\u00fafer de pila en el proceso de trabajo de NGINX, lo que lleva a una divulgaci\u00f3n limitada de memoria o a un reinicio.\n\nNota: Las versiones de software que han alcanzado el Fin del Soporte T\u00e9cnico (EoTS) no son evaluadas."}], "lastModified": "2026-10-26T14:10:00.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "0772572C-26F9-4FA4-B9E6-BA40ED59F569", "versionEndIncluding": "4.7.0", "versionStartIncluding": "4.3.0"}, {"criteria": "cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "C45452BD-7A86-48E7-8E1D-1B340FF70B3B"}, {"criteria": "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15B7F1FD-0C49-460F-9CB8-23DA730EC4BE", "versionEndIncluding": "1.6.2", "versionStartIncluding": "1.3.0"}, {"criteria": "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A6AA23F-A7A1-43DE-AD67-0EB1249143A4", "versionEndIncluding": "2.6.0", "versionStartIncluding": "2.0.0"}, {"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "10D5B143-4C1E-4626-8B49-3EA7160E9256", "versionEndIncluding": "3.7.2", "versionStartIncluding": "3.5.0"}, {"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "73A1CDBB-49F6-4AB6-AA67-542FD8017D6A", "versionEndIncluding": "4.0.1", "versionStartIncluding": "4.0.0"}, {"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "607EEFA3-BE2A-4660-8C67-E6FC9799325F", "versionEndIncluding": "5.4.2", "versionStartIncluding": "5.0.0"}, {"criteria": "cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CBC31553-99DE-4155-A8E5-13A84FCCB610", "versionEndIncluding": "2.22.0", "versionStartIncluding": "2.16.0"}, {"criteria": "cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BB2E27C7-2CF6-4EBD-8D5B-62AC1FAF2A82", "versionEndIncluding": "0.9.7", "versionStartIncluding": "0.3.50"}, {"criteria": "cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BC94D0FA-F4AE-4178-AE9A-8CB645E3DF7C", "versionEndIncluding": "1.30.0", "versionStartIncluding": "1.0.0"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0B153576-468F-48C2-9BC8-922A938AB235", "versionEndIncluding": "r36", "versionStartIncluding": "r32"}, {"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "F365BA5A-42D7-4024-9143-06D4DEE31212", "versionEndIncluding": "4.16.0", "versionStartIncluding": "4.9.0"}, {"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "8D720985-9119-480E-929A-7D9D5C083628", "versionEndIncluding": "5.8.0", "versionStartIncluding": "5.1.0"}, {"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "DE69C522-7FCB-4452-8E33-FCC72D36BF94", "versionEndIncluding": "5.12.1", "versionStartIncluding": "5.9.0"}], "operator": "OR"}]}], "sourceIdentifier": "f5sirt@f5.com"}