{
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    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    "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"
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        "category": "self",
        "summary": "Canonical URL",
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      "generator": {
        "date": "2026-10-05T20:17:30Z",
        "engine": {
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      "id": "CVE-2026-54872-ELS_OS-DEBIAN10ELS",
      "initial_release_date": "2026-09-29T15:32:15Z",
      "revision_history": [
        {
          "date": "2026-09-29T15:32:15Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-30T15:05:10Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-10-01T12:47:01Z",
          "number": "3",
          "summary": "Update document"
        },
        {
          "date": "2026-10-04T20:31:19Z",
          "number": "4",
          "summary": "Update document"
        },
        {
          "date": "2026-10-05T20:17:30Z",
          "number": "5",
          "summary": "Update document"
        }
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      "version": "5"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-54872",
      "notes": [
        {
          "category": "description",
          "text": "Issue summary: The generic elliptic-curve scalar multiplication used for\nECDSA and SM2 signature operations with curves that do not have a dedicated\nimplementation leaks information about the secret nonce through timing.\n\nImpact summary: An attacker able to measure signing times may learn\ninformation about the per-signature secret nonce, which over many signatures\ncan, via a lattice / Hidden Number Problem attack, lead to recovery of the\nprivate key.\n\nCWE: CWE-208: Observable Timing Discrepancy\n\nDescription: The generic elliptic-curve scalar multiplication used for\ncurves that do not have a dedicated constant-time implementation pads the\nsecret scalar with non-constant-time BIGNUM operations, so the time taken\ndepends on the value of the secret scalar derived from the ECDSA and SM2 nonce.\n\nThe leak is very small; observing it requires a large number of\nmeasurements. The effect is largest for curves whose group order lies\non a machine-word boundary, such as brainpoolP384r1.\n\nApplications using ECDSA signing over the Brainpool and other generic prime\ncurves, and SM2 signing on platforms that use the generic implementation,\nare vulnerable to this issue.\n\nThe NIST curves P-256, P-384 and P-521 use dedicated constant-time\nimplementations and are not affected.\n\nFIPS Impact: no\nThe FIPS modules are not affected: the approved NIST curves used in the FIPS\nprovider have dedicated constant-time implementations and do not use the\naffected code path.",
          "title": "Vulnerability description"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-54872"
        },
        {
          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/1a5bee8dc57430a2be69cd1ffe7fec6a62f4f179",
          "url": "https://github.com/openssl/openssl/commit/1a5bee8dc57430a2be69cd1ffe7fec6a62f4f179"
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          "summary": "https://github.com/openssl/openssl/commit/3f7e1363dccec6f7732bb9e9fa471bb6e4aa68cb",
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        },
        {
          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/7d83bc7764999dfd91b83b4f0815b45390422afd",
          "url": "https://github.com/openssl/openssl/commit/7d83bc7764999dfd91b83b4f0815b45390422afd"
        },
        {
          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/8166827a78aad164a07aa86dea2b425403ced471",
          "url": "https://github.com/openssl/openssl/commit/8166827a78aad164a07aa86dea2b425403ced471"
        },
        {
          "category": "external",
          "summary": "https://openssl-library.org/news/secadv/20260929.txt",
          "url": "https://openssl-library.org/news/secadv/20260929.txt"
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      ],
      "release_date": "2026-09-29T15:32:15Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-04T20:20:03.307107Z",
          "details": "This issue only arises when ECDSA or SM2 signing uses curves that lack dedicated constant‑time implementations (e.g., Brainpool via the generic EC path); deployments that use the NIST P‑256/P‑384/P‑521 curves or run with a FIPS provider are not affected. Exploitation requires gathering a very large number of high‑precision signing‑time measurements, which is inherently difficult to achieve over real‑world network paths and on virtualized/cloud hosts with scheduling and jitter noise. Given the high attack complexity and the need to explicitly configure affected non‑NIST curves and corresponding certificates to even hit the vulnerable code path, this CVE can be safely deprioritized in managed enterprise environments.",
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