{"answers":{"affected":"2 open source packages ship an affected version, including nginx and nginx-gateway. It affects 4 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42533 exists.","fix":"Upgrade nginx to a fixed version for your release line: 1.30.4 or 1.31.3.","what":"CVE-2026-42533 is a critical memory corruption vulnerability in F5 NGINX Open Source, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42533 and fix it if it is affected.\n\nWhat it is: CVE-2026-42533 is a critical memory corruption vulnerability in F5 NGINX Open Source, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42533 exists.\n\nAffected packages and fixed versions:\n- nginx (Bitnami): affected from 0.9.6; fixed in 1.30.4, 1.31.3\n- nginx-gateway (Bitnami): affected from 0.9.6; fixed in 1.30.4, 1.31.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42533/ (Markdown: https://insights.sbomify.com/CVE-2026-42533/index.md)","id":"CVE-2026-42533","markdown":"https://insights.sbomify.com/CVE-2026-42533/index.md","name":"CVE-2026-42533","record":{"aliases":["ALPINE-CVE-2026-42533","ALSA-2026:66542","ALSA-2026:67283","ALSA-2026:67308","ALSA-2026:67314","ALSA-2026:67315","AZL-92493","BELL-CVE-2026-42533","BIT-nginx-2026-42533","BIT-nginx-gateway-2026-42533","CLSA-2026-1784632234","CLSA-2026-1784647630","CLSA-2026-1784715967","CLSA-2026-1784800112","CLSA-2026-1784800609","CLSA-2026-1784800978","CLSA-2026-1784803387","CLSA-2026-1784803678","CLSA-2026-1784803994","CLSA-2026-1784804810","CLSA-2026-1784888515","CLSA-2026-1785413587","CLSA-2026-1791276939","DEBIAN-CVE-2026-42533","ECHO-ff61-cec3-1d6d","GHSA-fxfg-v4rj-hp95","MINI-86hq-v587-g4cr","MINI-88rq-692p-p4wf","MINI-8j5h-v4f5-xh4q","MINI-mm3m-37jq-234p","MINI-v5xw-v6h4-v63q","MINI-wcfm-75hx-36qr","RHSA-2026:66542","RHSA-2026:67283","RHSA-2026:67308","RHSA-2026:67314","RHSA-2026:67315","RLSA-2026:66542","RLSA-2026:67283","RLSA-2026:67308","RLSA-2026:67314","RLSA-2026:67315","ROOT-OS-ALPINE-315-CVE-2026-42533","ROOT-OS-ALPINE-320-CVE-2026-42533","ROOT-OS-DEBIAN-11-CVE-2026-42533","SUSE-SU-2026:23118-1","SUSE-SU-2026:23140-1","SUSE-SU-2026:3469-1","UBUNTU-CVE-2026-42533","USN-8563-3","USN-8563-4","USN-8563-5","openSUSE-SU-2026:21524-1"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"NGINX web server","requires_auth":"none","summary":"Remote attackers can cause denial of service or potentially execute code via heap buffer overflow in NGINX when specific map directive configurations are used.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"f5","cpe":[{"product":"nginx_gateway_fabric","vendor":"f5"},{"product":"nginx_ingress_controller","vendor":"f5"},{"product":"nginx_plus","vendor":"f5"},{"product":"waf","vendor":"f5"}],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap 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\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","ecosystems":["AlmaLinux:10","AlmaLinux:8","AlmaLinux:9","Bitnami","Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::crb","Rocky Linux:10","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise Module for Server Applications 15 SP7","SUSE:Linux Enterprise Server 15 SP6-LTSS","SUSE:Linux Enterprise Server 16.0","SUSE:Linux Enterprise Server for SAP Applications 15 SP6","SUSE:Linux Enterprise Server for SAP applications 16.0","openSUSE:Leap 16.0"],"exploits":{"exploitdb":0,"first_seen":"2026-07-04","github_poc":12,"max_poc_stars":35,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-27T08:03:07Z","kind":"github_poc","ref":"https://github.com/imbas007/CVE-2026-42533","stars":35,"title":"nginx heap buffer overflow PoC — CVE-2026-42533 pre-auth RCE via two-pass capture clobbering. Crash confirmed on Ubuntu 24.04."},{"date":"2026-07-04T11:05:56Z","kind":"github_poc","ref":"https://github.com/0xCyberstan/CVE-2026-42533-Config-Scanner","stars":32,"title":"Static config scanner that flags nginx configs vulnerable to the complex_value two-pass capture-clobbering bug (regex map + regex capture → heap overflow / info leak)."},{"date":"2026-07-20T07:22:22Z","kind":"github_poc","ref":"https://github.com/Daniyal48/ghostlock-vagrant-box","stars":1,"title":"An isolated Vagrant testbed designed to simulate a complete attack chain: Initial access via the Nginx heap buffer overflow (CVE-2026-42533) followed by root privilege escalation using the Ghostlock kernel vulnerability (CVE-2026-43449)."},{"date":"2026-07-22T12:48:07Z","kind":"github_poc","ref":"https://github.com/seguridadentrerios/CVE-2026-42533","stars":1,"title":"Vulnerabilidad en NGINX"},{"date":"2026-08-05T18:17:24Z","kind":"github_poc","ref":"https://github.com/0xCyberstan/CVE-2026-42533-POC","stars":1,"title":"CVE-2026-42533: pre-auth nginx heap overflow and info leak from PCRE capture clobbering in the map/script engine, chained to RCE."},{"date":"2026-07-20T01:20:58Z","kind":"github_poc","ref":"https://github.com/srkyn/nginx-map-risk-audit","stars":0,"title":"Defensive NGINX CVE-2026-42533 map regex risk audit with config scanner, Splunk/Defender notes, and lab evidence."},{"date":"2026-07-21T05:27:18Z","kind":"github_poc","ref":"https://github.com/suominen/CVE-2026-42533","stars":0,"title":"Tracking the nginx CVE-2026-42533 map/regex capture-clobbering heap overflow"},{"date":"2026-07-23T10:11:00Z","kind":"github_poc","ref":"https://github.com/gagaltotal/CVE-2026-42533-nginx","stars":0,"title":"CVE-2026-42533 Nginx"}],"tier":"weaponised"},"has_fix":true,"headline":"NGINX Map directive and Regex matching vulnerability","id":"CVE-2026-42533","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":170,"n_references":1,"next":{"headline":"Jostle logic bypass degrades resolution performance","id":"CVE-2026-42534"},"packages":[{"ecosystem":"Bitnami","fixed":["1.30.4","1.31.3"],"introduced":["0.9.6","1.31.0"],"last_affected":[],"package":"nginx","purl":"pkg:bitnami/nginx","source":"BIT-nginx-2026-42533"},{"ecosystem":"Bitnami","fixed":["1.30.4","1.31.3"],"introduced":["0.9.6","1.31.0"],"last_affected":[],"package":"nginx-gateway","purl":"pkg:bitnami/nginx-gateway","source":"BIT-nginx-gateway-2026-42533"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx","purl":"pkg:rpm/almalinux/nginx","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-all-modules","purl":"pkg:rpm/almalinux/nginx-all-modules","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-core","purl":"pkg:rpm/almalinux/nginx-core","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-filesystem","purl":"pkg:rpm/almalinux/nginx-filesystem","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-devel","purl":"pkg:rpm/almalinux/nginx-mod-devel","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-image-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-perl","purl":"pkg:rpm/almalinux/nginx-mod-http-perl","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-xslt-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-xslt-filter","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-mail","purl":"pkg:rpm/almalinux/nginx-mod-mail","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:10","fixed":["2:1.26.3-6.el10_2.7"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-stream","purl":"pkg:rpm/almalinux/nginx-mod-stream","source":"ALSA-2026:67314"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx","purl":"pkg:rpm/almalinux/nginx","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-all-modules","purl":"pkg:rpm/almalinux/nginx-all-modules","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-filesystem","purl":"pkg:rpm/almalinux/nginx-filesystem","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-devel","purl":"pkg:rpm/almalinux/nginx-mod-devel","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-image-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-perl","purl":"pkg:rpm/almalinux/nginx-mod-http-perl","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-xslt-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-xslt-filter","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-mail","purl":"pkg:rpm/almalinux/nginx-mod-mail","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:8","fixed":["1:1.24.0-3.module_el8.10.0+4275+5756017d.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-stream","purl":"pkg:rpm/almalinux/nginx-mod-stream","source":"ALSA-2026:67315"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx","purl":"pkg:rpm/almalinux/nginx","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx","purl":"pkg:rpm/almalinux/nginx","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx","purl":"pkg:rpm/almalinux/nginx","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-all-modules","purl":"pkg:rpm/almalinux/nginx-all-modules","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-all-modules","purl":"pkg:rpm/almalinux/nginx-all-modules","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx-all-modules","purl":"pkg:rpm/almalinux/nginx-all-modules","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-core","purl":"pkg:rpm/almalinux/nginx-core","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-core","purl":"pkg:rpm/almalinux/nginx-core","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx-core","purl":"pkg:rpm/almalinux/nginx-core","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-filesystem","purl":"pkg:rpm/almalinux/nginx-filesystem","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-filesystem","purl":"pkg:rpm/almalinux/nginx-filesystem","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx-filesystem","purl":"pkg:rpm/almalinux/nginx-filesystem","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-devel","purl":"pkg:rpm/almalinux/nginx-mod-devel","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-devel","purl":"pkg:rpm/almalinux/nginx-mod-devel","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-devel","purl":"pkg:rpm/almalinux/nginx-mod-devel","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-image-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter","source":"ALSA-2026:67308"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.20.1-28.el9_8.6.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-image-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter","source":"ALSA-2026:66542"},{"ecosystem":"AlmaLinux:9","fixed":["2:1.26.3-9.module_el9.8.0+309+b8a3c30d.4"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-image-filter","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter","source":"ALSA-2026:67283"},{"ecosystem":"AlmaLinux:9","fixed":["1:1.24.0-7.module_el9.8.0+307+7a7a3a71.5.alma.1"],"introduced":["0"],"last_affected":[],"package":"nginx-mod-http-perl","purl":"pkg:rpm/almalinux/nginx-mod-http-perl","source":"ALSA-2026:67308"}],"prev":{"headline":"Path traversal in visidata","id":"CVE-2026-42532"},"products":["NGINX Open Source","NGINX Plus"],"published":"2026-07-15","related":[{"cvss_score":9.2,"headline":"NGINX Open-Source ngx_http_v3_module vulnerability","id":"CVE-2026-42530","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":8.8,"headline":"NGINX ngx_http_slice_module vulnerability","id":"CVE-2026-60005","kev_date_added":null,"published":"2026-07-15"},{"cvss_score":8.6,"headline":"NGINX Gateway Fabric vulnerability","id":"CVE-2026-11311","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":8.6,"headline":"NGINX Gateway Fabric vulnerability","id":"CVE-2026-50107","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":8.3,"headline":"NGINX ngx_http_ssi_module vulnerability","id":"CVE-2026-56434","kev_date_added":null,"published":"2026-07-15"},{"cvss_score":8.2,"headline":"NGINX vulnerability","id":"CVE-2026-1642","kev_date_added":null,"published":"2026-02-04"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-29","vendors":["F5"]},"summary":"Remote attackers can cause denial of service or potentially execute code via heap buffer overflow in NGINX when specific map directive configurations are used.","url":"https://insights.sbomify.com/CVE-2026-42533/"}