{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-13T14:12:45Z",
  "bugzilla" : {
    "description" : "nginx: NGINX Open Source: Data injection via HTTP/2 proxy configuration",
    "id" : "2477068",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2477068"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-444",
  "details" : [ "When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "A flaw was found in NGINX Open Source. When NGINX is configured to proxy HTTP/2 traffic and uses `proxy_set_body`, a remote attacker may be able to inject malicious data into the upstream peer. This could lead to unintended data manipulation or bypass of security controls." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-05-23T00:00:00Z",
    "advisory" : "RHSA-2026:20351",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nginx-main-1.30.2-1.hum1"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "nginx:1.24/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "nginx:1.24/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "nginx:1.26/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42926\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42926\nhttps://my.f5.com/manage/s/article/K000161131" ],
  "name" : "CVE-2026-42926",
  "mitigation" : {
    "value" : "To mitigate this issue, avoid configuring NGINX to proxy HTTP/2 traffic with the `proxy_http_version 2` directive in conjunction with `proxy_set_body`. If HTTP/2 proxying is essential, ensure that all proxied content is thoroughly validated to prevent malicious data injection. Modifying NGINX configuration files typically requires a service reload or restart for changes to take effect.",
    "lang" : "en:us"
  },
  "csaw" : false
}