CVE-2026-42055

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"baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}], "cvssMetricV40": [{"type": "Secondary", "source": "f5sirt@f5.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "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_proxy_v2_module", "ngx_http_grpc_module"], "product": "NGINX Open Source", "versions": [{"status": "affected", "version": "1.13.10", "lessThan": "1.31.2", "versionType": "custom"}, {"status": "affected", "version": "1.30.2", "lessThan": "1.30.3", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "F5", "modules": ["ngx_http_proxy_v2_module", "ngx_http_grpc_module"], "product": "NGINX Plus", "versions": [{"status": "affected", "version": "37.0", "lessThan": "37.0.2.1", "versionType": "custom"}, {"status": "affected", "version": "R36", "lessThan": "R36 P6", "versionType": "custom"}], "defaultStatus": "unaffected"}]}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "affectedData": [{"cpes": ["cpe:/o:redhat:enterprise_linux:10.2"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "versions": [{"status": "unaffected", "version": "2:1.26.3-6.el10_2.5", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "versions": [{"status": "unaffected", "version": "8100020260707171317.489197e6", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx:1.24", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "versions": [{"status": "unaffected", "version": "2:1.20.1-28.el9_8.4", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "versions": [{"status": "unaffected", "version": "9080020260707164406.9", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx:1.24", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "versions": [{"status": "unaffected", "version": "9080020260707110000.9", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx:1.26", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:hummingbird:1"], "vendor": "Red Hat", "product": "Red Hat Hardened Images", "versions": [{"status": "unaffected", "version": "1.30.3-2.hum1", "lessThan": "*", "versionType": "rpm"}], "packageName": "nginx-main", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift_data_foundation:4"], "vendor": "Red Hat", "product": "Red Hat Openshift Data Foundation 4", "packageName": "odf4/ocs-client-console-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openshift_data_foundation:4"], "vendor": "Red Hat", "product": "Red Hat Openshift Data Foundation 4", "packageName": "odf4/odf-console-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift_data_foundation:4"], "vendor": "Red Hat", "product": "Red Hat Openshift Data Foundation 4", "packageName": "odf4/odf-multicluster-console-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}], "published": "2026-06-17T15:16:50.353", "references": [{"url": "https://my.f5.com/manage/s/article/K000161584", "tags": ["Vendor Advisory"], "source": "f5sirt@f5.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:27197", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:36331", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:36364", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:36618", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:36639", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:38847", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-42055", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2489866", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42055.json", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "f5sirt@f5.com", "description": [{"lang": "en", "value": "CWE-122"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-131"}]}], "descriptions": [{"lang": "en", "value": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module\u00a0and ngx_http_grpc_module\u00a0modules. This vulnerability exists when the proxy_http_version to 2\u00a0or grpc_pass\u00a0directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers\u00a0directive is set to off, and the large_client_header_buffers\u00a0directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "lastModified": "2026-07-15T02:21:24.690", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*", "vulnerable": true, "matchCriteriaId": "DACAC9CB-16D3-4F55-A466-70035779B387"}, {"criteria": "cpe:2.3:a:f5:nginx_app_protect_dos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4F9DC498-9755-4CFA-9EA5-0009A3EE791F", "versionEndIncluding": "4.7.0", "versionStartIncluding": "4.3.0"}, {"criteria": "cpe:2.3:a:f5:nginx_app_protect_waf:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A70F49F1-8FD2-45E8-8681-27745BDB35B7", "versionEndIncluding": "4.16.0", "versionStartIncluding": "4.10.0"}, {"criteria": "cpe:2.3:a:f5:nginx_app_protect_waf:*:*:*:*:*:*:*:*", "vulnerable": 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