{"id":"CVE-2026-42530","details":"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 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.","aliases":["BIT-nginx-2026-42530","BIT-nginx-gateway-2026-42530"],"modified":"2026-08-17T16:27:03.133727357Z","published":"2026-06-17T15:16:50.630Z","related":["CGA-vhcx-c46j-hvjh","openSUSE-SU-2026:11066-1"],"database_specific":{"unresolved_ranges":[{"source":"CPE_RANGE","vendor_product":"f5:nginx_ingress_controller","cpes":["cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.5.0"},{"last_affected":"3.7.2"},{"introduced":"5.0.0"},{"fixed":"5.5.1"}]},{"extracted_events":[{"introduced":"2.17.0"},{"last_affected":"2.22.0"}],"source":"CPE_RANGE","vendor_product":"f5:nginx_instance_manager","cpes":["cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*"]},{"source":"CPE_STRING","vendor_product":"f5:nginx_ingress_controller","cpes":["cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:*","cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"4.0.0"},{"last_affected":"4.0.0"},{"introduced":"4.0.1"},{"last_affected":"4.0.1"}]}]},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20351"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42530"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2489872"},{"type":"ADVISORY","url":"https://my.f5.com/manage/s/article/K000161616"},{"type":"ADVISORY","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.json"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nginx/nginx","events":[{"introduced":"e8053c867f9ab14f323e3019ccab585d857abb66"},{"fixed":"2fd01ed47a1fd2965754c83f53b33a789d0e07f1"}],"database_specific":{"extracted_events":[{"introduced":"1.31.0"},{"fixed":"1.31.2"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*"}}],"versions":["release-1.31.1","release-1.31.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42530.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/nginx/nginx-gateway-fabric","events":[{"introduced":"3a372747333fb1db372af7cf0b18ed7eef7c91f7"},{"last_affected":"532db6a20b2912fe397211eef9f8d564d46a4bdd"},{"introduced":"7dad8b31e3f0c3eadce36fed8c276e83e6583d24"},{"fixed":"66691213cd771fe56b124786ea6701c7fb8e467a"}],"database_specific":{"extracted_events":[{"introduced":"1.3.0"},{"last_affected":"1.6.2"},{"introduced":"2.0.0"},{"fixed":"2.6.4"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42530.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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/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"}]}