{"id":"BIT-nginx-2026-42945","summary":"NGINX ngx_http_rewrite_module vulnerability","details":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","aliases":["BIT-nginx-gateway-2026-42945","CVE-2026-42945"],"modified":"2026-09-08T08:47:44.399381769Z","published":"2026-05-15T08:50:08.298Z","database_specific":{"severity":"Critical","cpes":["cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://depthfirst.com/nginx-rift"},{"type":"ADVISORY","url":"https://github.com/DepthFirstDisclosures/Nginx-Rift"},{"type":"ADVISORY","url":"https://my.f5.com/manage/s/article/K000161019"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42945"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17417"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17751"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17752"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17753"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17790"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17791"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17792"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17793"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17794"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:18029"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:18041"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:18063"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19159"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19371"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19372"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19374"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:20442"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:20444"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21275"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22382"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22383"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22388"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22389"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22390"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22393"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22394"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22396"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-42945"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477116"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42945.json"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:58981"}],"affected":[{"package":{"name":"nginx","ecosystem":"Bitnami","purl":"pkg:bitnami/nginx"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.6.27"},{"fixed":"1.30.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nginx/BIT-nginx-2026-42945.json"},"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"}]}],"schema_version":"1.9.0"}