{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-13T14:12:44Z",
  "bugzilla" : {
    "description" : "nginx: ngx_http_charset_module: information disclosure and denial of service",
    "id" : "2477066",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2477066"
  },
  "cvss3" : {
    "cvss3_base_score" : "4.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-126",
  "details" : [ "A flaw was found in the ngx_http_charset_module module of NGINX. When charset, source_charset, charset_map and proxy_pass with disabled buffering (\"off\") directives are configured, an unauthenticated attacker can send crafted requests and cause a heap-based buffer over-read in the worker process, resulting in a limited disclosure of memory or a denial of service by forcing the process to restart." ],
  "statement" : "To exploit this vulnerability, the charset, source_charset, charset_map and proxy_pass directives must be configured with disabled buffering, limiting its exposure as this is not the default configuration. Also, configurations that do not recode a UTF-8 response through charset_map are not vulnerable. This issue allows an attacker to have limited control to disclose memory content from the worker process or cause a denial of service by forcing the process to restart, but it cannot cause a complete system denial of service. Due to these reasons, this flaw has been rated with a moderate severity.",
  "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"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nginx",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Lightspeed proxy 1",
    "fix_state" : "Fix deferred",
    "package_name" : "insights-proxy/insights-proxy-container-rhel9",
    "cpe" : "cpe:/a:redhat:insights_proxy:1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42934\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42934\nhttps://my.f5.com/manage/s/article/K000161028" ],
  "name" : "CVE-2026-42934",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, enable proxy buffering (the default configuration).",
    "lang" : "en:us"
  },
  "csaw" : false
}