{
  "threat_severity" : "Moderate",
  "public_date" : "2026-01-20T20:41:55Z",
  "bugzilla" : {
    "description" : "nodejs: Nodejs denial of service",
    "id" : "2431340",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2431340"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.9",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-248",
  "details" : [ "A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.", "A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped." ],
  "statement" : "Systems configured according to Red Hat guidelines should have their services set to restart in the event of a process crash. This Host system service management mitigates the availability impact to Red Hat customers.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-02-05T00:00:00Z",
    "advisory" : "RHSA-2026:1842",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "nodejs24-1:24.13.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-02-05T00:00:00Z",
    "advisory" : "RHSA-2026:1843",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "nodejs22-1:22.22.0-3.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7675",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "nodejs24-1:24.14.1-2.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-02-18T00:00:00Z",
    "advisory" : "RHSA-2026:2899",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "nodejs22-1:22.22.0-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-10T00:00:00Z",
    "advisory" : "RHSA-2026:2420",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:24-8100020260116121421.6d880403"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-10T00:00:00Z",
    "advisory" : "RHSA-2026:2421",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:22-8100020260119091831.6d880403"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-10T00:00:00Z",
    "advisory" : "RHSA-2026:2422",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:20-8100020260119100525.489197e6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7670",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nodejs:24-8100020260408131901.6d880403"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2781",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:24-9070020260117213814.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2782",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:22-9070020260117213838.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2783",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:20-9070020260117213748.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-04-09T00:00:00Z",
    "advisory" : "RHSA-2026:7350",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "nodejs:24-9070020260402152654.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2768",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "nodejs:20-9040020260211171433.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2767",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "nodejs:20-9060020260210180816.rhel9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-02-18T00:00:00Z",
    "advisory" : "RHSA-2026:2864",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "nodejs:22-9060020260210120402.rhel9"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-01T00:00:00Z",
    "advisory" : "RHSA-2026:6402",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs24-main-24.14.1-4.hum1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-02T00:00:00Z",
    "advisory" : "RHSA-2026:6431",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs25-main-25.9.0-1.hum1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-10T00:00:00Z",
    "advisory" : "RHSA-2026:7386",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs20-main-20.20.0-7.1.hum1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-10T00:00:00Z",
    "advisory" : "RHSA-2026:7387",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs22-main-22.22.0-1.3.hum1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-21637\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21637\nhttps://nodejs.org/en/blog/vulnerability/december-2025-security-releases" ],
  "name" : "CVE-2026-21637",
  "mitigation" : {
    "value" : "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
    "lang" : "en:us"
  },
  "csaw" : false
}