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Vulnerability from bitnami_vulndb
Published
2026-05-15 08:50
Modified
2026-09-08 08:34
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.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "nginx",
        "purl": "pkg:bitnami/nginx"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.6.27"
            },
            {
              "fixed": "1.30.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "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",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42945"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*"
    ],
    "severity": "Critical"
  },
  "details": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module\u00a0module. This vulnerability exists when the rewrite\u00a0directive is followed by a rewrite, if, or set\u00a0directive 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.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
  "id": "BIT-nginx-2026-42945",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-05-15T08:50:08.298Z",
  "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"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "NGINX ngx_http_rewrite_module vulnerability"
}



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