{
  "threat_severity" : "Important",
  "public_date" : "2026-08-04T15:57:24Z",
  "bugzilla" : {
    "description" : "nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service",
    "id" : "2511089",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2511089"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-825",
  "details" : [ "A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free.\nThis vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.", "A heap use-after-free vulnerability in the Node.js HTTP/2 component allows a remote attacker to crash the application, causing a denial of service. This is triggered by an unexpected re-entrant call to nghttp2_session_mem_send() while nghttp2_session_mem_recv() is still executing." ],
  "statement" : "A remote attacker can exploit an Important heap use-after-free vulnerability in Node.js HTTP/2 to crash applications. The flaw, caused by re-entrant memory operations, leads to a denial of service for Red Hat environments with HTTP/2 enabled.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61376",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "nodejs22-1:22.23.2-1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61377",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "nodejs24-1:24.19.0-1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-09-08T00:00:00Z",
    "advisory" : "RHSA-2026:64817",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "nodejs22-1:22.23.2-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-09-01T00:00:00Z",
    "advisory" : "RHSA-2026:62219",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:22-8100020260819113925.6d880403"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-09-02T00:00:00Z",
    "advisory" : "RHSA-2026:62583",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:24-8100020260819113942.6d880403"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61383",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:22-9080020260819113937.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61386",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:24-9080020260819113946.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-09-02T00:00:00Z",
    "advisory" : "RHSA-2026:62416",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "nodejs:22-9060020260901085634.rhel9"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "nodejs:26/nodejs",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nodejs20",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nodejs22",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nodejs24",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nodejs25",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "nodejs26",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-56848\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56848\nhttps://nodejs.org/en/blog/vulnerability/july-2026-security-releases" ],
  "name" : "CVE-2026-56848",
  "mitigation" : {
    "value" : "Restrict network access to Node.js HTTP/2 listeners to trusted clients only. If HTTP/2 is not required, disable it to remove the vulnerable handler from the attack surface.",
    "lang" : "en:us"
  },
  "csaw" : false
}