{"id":"CVE-2026-42530","title":"NGINX Open Source has a vulnerability in the ngx_http_v3_module module","summary":"NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"f5","product":"nginx_gateway_fabric","affected":["nginx_gateway_fabric >= 1.3.0, <= 1.6.2","nginx_gateway_fabric >= 2.0.0, < 2.6.4","nginx_ingress_controller >= 3.5.0, <= 3.7.2","nginx_ingress_controller >= 5.0.0, < 5.5.1","nginx_ingress_controller = 4.0.0","nginx_ingress_controller = 4.0.1","nginx_instance_manager >= 2.17.0, <= 2.22.0","nginx_open_source >= 1.31.0, < 1.31.2"],"patched":["nginx_gateway_fabric 2.6.4","nginx_ingress_controller 5.5.1","nginx_open_source 1.31.2"],"published":"2026-06-17","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42530","references":[{"url":"https://my.f5.com/manage/s/article/K000161616","label":"f5sirt@f5.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42530","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2489872","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd","exploit-available"],"epss":0.03825,"epssPercentile":0.89609,"ingestedAt":"2026-07-03T13:02:27.796Z","exploits":{"github":3,"githubRepos":["https://github.com/v4ltonn/CVE-2026-42530","https://github.com/0xBlackash/CVE-2026-42530","https://github.com/HORKimhab/CVE-2026-42530"],"checkedAt":"2026-09-23T07:14:04.891Z"},"exploitAvailable":true,"slug":"CVE-2026-42530","body":"## Overview\n\nNGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free 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.\n\n## Affected\n\n- `nginx_gateway_fabric >= 1.3.0, <= 1.6.2`\n- `nginx_gateway_fabric >= 2.0.0, < 2.6.4`\n- `nginx_ingress_controller >= 3.5.0, <= 3.7.2`\n- `nginx_ingress_controller >= 5.0.0, < 5.5.1`\n- `nginx_ingress_controller = 4.0.0`\n- `nginx_ingress_controller = 4.0.1`\n- `nginx_instance_manager >= 2.17.0, <= 2.22.0`\n- `nginx_open_source >= 1.31.0, < 1.31.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `nginx_gateway_fabric 2.6.4`\n- `nginx_ingress_controller 5.5.1`\n- `nginx_open_source 1.31.2`","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.8,"exploitation":12,"ransomware":0},"changes":[{"seq":5207,"id":"CVE-2026-42530","ts":1788887253560,"field":"exploit_available","old":"false","new":"true"},{"seq":4090,"id":"CVE-2026-42530","ts":1788886369416,"field":"exploit_available","old":"true","new":"false"},{"seq":2867,"id":"CVE-2026-42530","ts":1788883035735,"field":"exploit_available","old":"false","new":"true"},{"seq":1896,"id":"CVE-2026-42530","ts":1788882438868,"field":"exploit_available","old":"true","new":"false"},{"seq":993,"id":"CVE-2026-42530","ts":1788881873221,"field":"exploit_available","old":"false","new":"true"}]}