{
  "threat_severity" : "Important",
  "public_date" : "2026-06-17T14:04:32Z",
  "bugzilla" : {
    "description" : "nginx: ngx_http_v3_module: use-after-free issue leads to denial of service",
    "id" : "2489872",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2489872"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free 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.  \nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "A flaw was found in the ngx_http_v3_module module of NGINX. When NGINX is configured to use the HTTP/3 QUIC module, an attacker can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream and cause a use-after-free issue, potentially allowing code execution or a denial of service by forcing the process to restart." ],
  "statement" : "This vulnerability is only exploitable when NGINX is configured to use the HTTP/3 QUIC module. This issue allows a remote unauthenticated attacker to potentially execute arbitrary code or cause a denial of service by forcing the worker process to restart.\nDefault Red Hat Enterprise Linux security features, including SELinux enforcement, Address Space Layout Randomization (ASLR) and NX (No-Execute) stack protection, significantly increase the difficulty of achieving arbitrary code execution, limiting the impact of this vulnerability.\nDue to these reasons, this vulnerability has been rated with an important severity.",
  "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" : "Not affected",
    "package_name" : "nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "nginx:1.24/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "nginx:1.24/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "nginx:1.26/nginx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Lightspeed proxy 1",
    "fix_state" : "Not affected",
    "package_name" : "insights-proxy/insights-proxy-container-rhel9",
    "cpe" : "cpe:/a:redhat:insights_proxy:1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42530\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42530\nhttps://my.f5.com/manage/s/article/K000161616" ],
  "name" : "CVE-2026-42530",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, disable HTTP/3 by removing quic from all listen directives.",
    "lang" : "en:us"
  },
  "csaw" : false
}