{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: Stack overflow exception handling in async_hooks\n     - debian/patches/CVE-2025-59466.patch: rethrow stack overflow exceptions\n       in async_hooks instead of calling FatalException\n     - CVE-2025-59466\n   * SECURITY UPDATE: TLS callback exception handling vulnerability\n     - debian/patches/CVE-2026-21637.patch: route pskCallback exceptions through\n       error handlers to prevent remote attackers from crashing TLS servers\n     - CVE-2026-21637",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_alt_nodejs/ubuntu24.04/advisories/2026/clsa-2026_1770904294.json"
      },
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els-alt-nodejs/releases/CLSA-2026:1770904294",
        "url": "https://cve.tuxcare.com/els-alt-nodejs/releases/CLSA-2026:1770904294"
      }
    ],
    "tracking": {
      "current_release_date": "2026-02-12T13:52:15Z",
      "generator": {
        "date": "2026-02-12T13:52:15Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1770904294",
      "initial_release_date": "2026-02-12T13:52:15Z",
      "revision_history": [
        {
          "date": "2026-02-12T13:52:15Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2025-59466, CVE-2026-21637"
  },
  "product_tree": {
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        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 24.04",
                "product": {
                  "name": "Ubuntu 24.04",
                  "product_id": "Ubuntu-24",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*"
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            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
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        "category": "vendor",
        "name": "Canonical Ltd."
      },
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            "category": "architecture",
            "name": "amd64"
          }
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        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-nodejs14-npm-0:6.14.18-14.21.3-18.amd64 as a component of Ubuntu 24.04",
          "product_id": "Ubuntu-24:alt-nodejs14-npm-0:6.14.18-14.21.3-18.amd64"
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          "product_id": "Ubuntu-24:alt-nodejs14-nodejs-devel-0:14.21.3-18.amd64"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-21637",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Ubuntu-24:alt-nodejs14-docs-0:14.21.3-18.amd64",
          "Ubuntu-24:alt-nodejs14-nodejs-0:14.21.3-18.amd64",
          "Ubuntu-24:alt-nodejs14-nodejs-devel-0:14.21.3-18.amd64",
          "Ubuntu-24:alt-nodejs14-npm-0:6.14.18-14.21.3-18.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-nodejs/cve/CVE-2026-21637"
        },
        {
          "category": "external",
          "summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
          "url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"
        }
      ],
      "release_date": "2026-01-20T21:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-02-12T13:51:36.258491Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-nodejs/releases/CLSA-2026:1770904294",
          "product_ids": [
            "Ubuntu-24:alt-nodejs14-docs-0:14.21.3-18.amd64",
            "Ubuntu-24:alt-nodejs14-nodejs-0:14.21.3-18.amd64",
            "Ubuntu-24:alt-nodejs14-nodejs-devel-0:14.21.3-18.amd64",
            "Ubuntu-24:alt-nodejs14-npm-0:6.14.18-14.21.3-18.amd64"
          ],
          "url": "https://cve.tuxcare.com/els-alt-nodejs/releases/CLSA-2026:1770904294"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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            "Ubuntu-24:alt-nodejs14-nodejs-0:14.21.3-18.amd64",
            "Ubuntu-24:alt-nodejs14-nodejs-devel-0:14.21.3-18.amd64",
            "Ubuntu-24:alt-nodejs14-npm-0:6.14.18-14.21.3-18.amd64"
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          "details": "Important"
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      "cwe": {
        "id": "CWE-248",
        "name": "Uncaught Exception"
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        {
          "category": "description",
          "text": "We have identified a bug in Node.js error handling where \"Maximum call stack size exceeded\" errors become uncatchable when `async_hooks.createHook()` is enabled. Instead of reaching `process.on('uncaughtException')`, the process terminates, making the crash unrecoverable. Applications that rely on `AsyncLocalStorage` (v22, v20) or `async_hooks.createHook()` (v24, v22, v20) become vulnerable to denial-of-service crashes triggered by deep recursion under specific conditions.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-nodejs/cve/CVE-2025-59466"
        },
        {
          "category": "external",
          "summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
          "url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"
        }
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          "date": "2026-02-12T13:51:36.258491Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-nodejs/releases/CLSA-2026:1770904294",
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        }
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            "attackVector": "NETWORK",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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