{"id":"CVE-2026-9256","details":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. 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\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","aliases":["BIT-nginx-2026-9256","BIT-nginx-gateway-2026-9256"],"modified":"2026-06-24T18:29:29.347116088Z","published":"2026-05-22T15:16:27.073Z","related":["CGA-hf9f-9rwg-rp86","SUSE-SU-2026:22178-1","SUSE-SU-2026:2307-1","SUSE-SU-2026:2370-1","openSUSE-SU-2026:10852-1"],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*"],"vendor_product":"f5:nginx_plus","source":"CPE_RANGE","extracted_events":[{"introduced":"37.0.0"},{"fixed":"37.0.1.1"},{"introduced":"r32"},{"last_affected":"r36"}]}]},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2026/06/msg00023.html"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/05/22/14"},{"type":"ADVISORY","url":"https://my.f5.com/manage/s/article/K000161377"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nginx/nginx","events":[{"introduced":"805d9db723e74bbe84e6df1be29fda28abcc23ea"},{"last_affected":"955370fc8c12b1a945941f844adc9df49a0f3f32"},{"introduced":"a2a09a84eb0a7059880500e70b40796ab1dd0c4d"},{"last_affected":"9a503b1317c283e1fd0f27008428ea441c1ac9ee"},{"introduced":"0"},{"last_affected":"e8053c867f9ab14f323e3019ccab585d857abb66"}],"database_specific":{"cpe":["cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*","cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*"],"source":["CPE_RANGE","CPE_STRING"],"extracted_events":[{"introduced":"0.1.17"},{"last_affected":"0.9.7"},{"introduced":"1.0.0"},{"last_affected":"1.30.1"},{"introduced":"0"},{"last_affected":"1.31.0"}]}}],"versions":["release-1.30.1","release-1.31.0","release-1.30.0","release-1.29.8","release-1.29.7","release-1.29.6","release-1.29.5","release-1.29.4","release-1.29.3","release-1.29.2","release-1.29.1","release-1.29.0","release-1.27.5","release-1.27.4","release-1.27.3","release-1.27.2","release-1.27.1","release-1.27.0","release-1.25.5","release-1.25.4","release-1.25.3","release-1.25.2","release-1.25.1","release-1.25.0","release-1.23.4","release-1.23.3","release-1.23.2","release-1.23.1","release-1.23.0","release-1.21.6","release-1.21.5","release-1.21.4","release-1.21.3","release-1.21.2","release-1.21.1","release-1.21.0","release-1.19.10","release-1.19.9","release-1.19.8","release-1.19.7","release-1.19.6","release-1.19.5","release-1.19.4","release-1.19.3","release-1.19.2","release-1.19.1","release-1.19.0","release-1.17.10","release-1.17.9","release-1.17.8","release-1.17.7","release-1.17.6","release-1.17.5","release-1.17.4","release-1.17.3","release-1.17.2","release-1.17.1","release-1.17.0","release-1.15.12","release-1.15.11","release-1.15.10","release-1.15.9","release-1.15.8","release-1.15.7","release-1.15.6","release-1.15.5","release-1.15.4","release-1.15.3","release-1.15.2","release-1.15.1","release-1.15.0","release-1.13.12","release-1.13.11","release-1.13.10","release-1.13.9","release-1.13.8","release-1.13.7","release-1.13.6","release-1.13.5","release-1.13.4","release-1.13.3","release-1.13.2","release-1.13.1","release-1.13.0","release-1.11.13","release-1.11.12","release-1.11.11","release-1.11.10","release-1.11.9","release-1.11.8","release-1.11.7","release-1.11.6","release-1.11.5","release-1.11.4","release-1.11.3","release-1.11.2","release-1.11.1","release-1.11.0","release-1.9.15","release-1.9.14","release-1.9.13","release-1.9.12","release-1.9.11","release-1.9.10","release-1.9.9","release-1.9.8","release-1.9.7","release-1.9.6","release-1.9.5","release-1.9.4","release-1.9.3","release-1.9.2","release-1.9.1","release-1.9.0","release-1.7.12","release-1.7.11","release-1.7.10","release-1.7.9","release-1.7.8","release-1.7.7","release-1.7.6","release-1.7.5","release-1.7.4","release-1.7.3","release-1.7.2","release-1.7.1","release-1.7.0","release-1.5.13","release-1.5.12","release-1.5.11","release-1.5.10","release-1.5.9","release-1.5.8","release-1.5.7","release-1.5.6","release-1.5.5","release-1.5.4","release-1.5.3","release-1.5.2","release-1.5.1","release-1.5.0","release-1.4.0","release-1.3.16","release-1.3.15","release-1.3.14","release-1.3.13","release-1.3.12","release-1.3.11","release-1.3.10","release-1.3.9","release-1.3.8","release-1.3.7","release-1.3.6","release-1.3.5","release-1.3.4","release-1.3.3","release-1.3.2","release-1.3.1","release-1.3.0","release-1.2.0","release-1.1.19","release-1.1.18","release-1.1.17","release-1.1.16","release-1.1.15","release-1.1.14","release-1.1.13","release-1.1.12","release-1.1.11","release-1.1.10","release-1.1.9","release-1.1.8","release-1.1.7","release-1.1.6","release-1.1.5","release-1.1.4","release-1.1.3","release-1.1.2","release-1.1.1","release-1.1.0","release-1.0.5","release-1.0.4","release-1.0.3","release-1.0.2","release-1.0.1","release-1.0.0","release-0.9.7","release-0.9.6","release-0.9.5","release-0.9.4","release-0.9.3","release-0.9.2","release-0.9.1","release-0.9.0","release-0.8.53","release-0.8.52","release-0.8.51","release-0.8.50","release-0.8.49","release-0.8.48","release-0.8.47","release-0.8.46","release-0.8.45","release-0.8.44","release-0.8.43","release-0.8.42","release-0.8.41","release-0.8.40","release-0.8.39","release-0.8.38","release-0.8.37","release-0.8.36","release-0.8.35","release-0.8.34","release-0.8.33","release-0.8.32","release-0.8.31","release-0.8.30","release-0.8.29","release-0.8.28","release-0.8.27","release-0.8.26","release-0.8.25","release-0.8.24","release-0.8.23","release-0.8.22","release-0.8.21","release-0.8.20","release-0.8.19","release-0.8.18","release-0.8.17","release-0.8.16","release-0.8.15","release-0.8.14","release-0.8.13","release-0.8.12","release-0.8.11","release-0.8.10","release-0.8.9","release-0.8.8","release-0.8.7","release-0.8.6","release-0.8.5","release-0.8.4","release-0.8.3","release-0.8.2","release-0.8.1","release-0.8.0","release-0.7.59","release-0.7.58","release-0.7.57","release-0.7.56","release-0.7.55","release-0.7.54","release-0.7.53","release-0.7.52","release-0.7.51","release-0.7.50","release-0.7.49","release-0.7.48","release-0.7.47","release-0.7.46","release-0.7.45","release-0.7.44","release-0.7.43","release-0.7.42","release-0.7.41","release-0.7.40","release-0.7.39","release-0.7.38","release-0.7.37","release-0.7.36","release-0.7.35","release-0.7.34","release-0.7.33","release-0.7.32","release-0.7.31","release-0.7.30","release-0.7.29","release-0.7.28","release-0.7.27","release-0.7.26","release-0.7.25","release-0.7.24","release-0.7.23","release-0.7.22","release-0.7.21","release-0.7.20","release-0.7.19","release-0.7.18","release-0.7.17","release-0.7.16","release-0.7.15","release-0.7.14","release-0.7.13","release-0.7.12","release-0.7.11","release-0.7.10","release-0.7.9","release-0.7.8","release-0.7.7","release-0.7.6","release-0.7.5","release-0.7.4","release-0.7.3","release-0.7.2","release-0.7.1","release-0.7.0","release-0.6.31","release-0.6.30","release-0.6.29","release-0.6.28","release-0.6.27","release-0.6.26","release-0.6.25","release-0.6.24","release-0.6.23","release-0.6.22","release-0.6.21","release-0.6.20","release-0.6.19","release-0.6.18","release-0.6.17","release-0.6.16","release-0.6.15","release-0.6.14","release-0.6.13","release-0.6.12","release-0.6.11","release-0.6.10","release-0.6.9","release-0.6.8","release-0.6.7","release-0.6.6","release-0.6.5","release-0.6.4","release-0.6.3","release-0.6.2","release-0.6.1","release-0.6.0","release-0.5.25","release-0.5.24","release-0.5.23","release-0.5.22","release-0.5.21","release-0.5.20","release-0.5.19","release-0.5.18","release-0.5.17","release-0.5.16","release-0.5.15","release-0.5.14","release-0.5.13","release-0.5.12","release-0.5.11","release-0.5.10","release-0.5.9","release-0.5.8","release-0.5.7","release-0.5.6","release-0.5.5","release-0.5.4","release-0.5.3","release-0.5.2","release-0.5.1","release-0.5.0","release-0.4.14","release-0.4.13","release-0.4.12","release-0.4.11","release-0.4.10","release-0.4.9","release-0.4.8","release-0.4.7","release-0.4.6","release-0.4.5","release-0.4.4","release-0.4.3","release-0.4.2","release-0.4.1","release-0.4.0","release-0.3.61","release-0.3.60","release-0.3.59","release-0.3.58","release-0.3.57","release-0.3.56","release-0.3.55","release-0.3.54","release-0.3.53","release-0.3.52","release-0.3.51","release-0.3.50","release-0.3.49","release-0.3.48","release-0.3.47","release-0.3.46","release-0.3.45","release-0.3.44","release-0.3.43","release-0.3.42","release-0.3.41","release-0.3.40","release-0.3.39","release-0.3.38","release-0.3.37","release-0.3.36","release-0.3.35","release-0.3.34","release-0.3.33","release-0.3.32","release-0.3.31","release-0.3.30","release-0.3.29","release-0.3.28","release-0.3.27","release-0.3.26","release-0.3.25","release-0.3.24","release-0.3.23","release-0.3.22","release-0.3.21","release-0.3.20","release-0.3.19","release-0.3.18","release-0.3.17","release-0.3.16","release-0.3.15","release-0.3.14","release-0.3.13","release-0.3.12","release-0.3.11","release-0.3.10","release-0.3.9","release-0.3.8","release-0.3.7","release-0.3.6","release-0.3.5","release-0.3.4","release-0.3.3","release-0.3.2","release-0.3.1","release-0.3.0","release-0.2.6","release-0.2.5","release-0.2.4","release-0.2.3","release-0.2.2","release-0.2.1","release-0.2.0","release-0.1.45","release-0.1.44","release-0.1.43","release-0.1.42","release-0.1.41","release-0.1.40","release-0.1.39","release-0.1.38","release-0.1.37","release-0.1.36","release-0.1.35","release-0.1.34","release-0.1.33","release-0.1.32","release-0.1.31","release-0.1.30","release-0.1.29","release-0.1.28","release-0.1.27","release-0.1.26","release-0.1.25","release-0.1.24","release-0.1.23","release-0.1.22","release-0.1.21","release-0.1.20","release-0.1.19","release-0.1.18","release-0.1.17"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-9256.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}