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    "category": "csaf_vex",
    "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-2026-54873-ELS_OS-DEBIAN10ELS",
      "initial_release_date": "2026-09-29T16:17:00Z",
      "revision_history": [
        {
          "date": "2026-09-29T16:17:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-10-01T12:47:03Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-10-05T02:39:30Z",
          "number": "3",
          "summary": "Update document"
        },
        {
          "date": "2026-10-05T20:17:30Z",
          "number": "4",
          "summary": "Update document"
        }
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      "status": "final",
      "version": "4"
    },
    "title": "Security update on CVE-2026-54873"
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      "cve": "CVE-2026-54873",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "notes": [
        {
          "category": "description",
          "text": "Issue summary: QUIC process may keep memory for QUIC packet\nbuffer for much longer period than necessary.\n\nImpact summary: Remote peer can exploit this vulnerability\nby sending maliciously crafted packets, making the local\nQUIC stack to keep the memory for packet buffers allocated.\nThe time for which the memory remains allocated is entirely\nunder the control of the potentially malicious remote peer.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: To save copy operation from the packet buffer to the\nstream reassemble buffer the QUIC stack leaves the stream data\non the packet buffer waiting to be copied to a buffer provided\nby the local receiving application. The QUIC stack releases\na reference to the packet buffer only after the data are copied\nto the application buffer. This design is more efficient for\nlegitimate data transfers but enables an attacker to allocate a lot\nmore memory than actually required by the data kept in the receiving\nstream buffer.\n\nTo mitigate the vulnerability, the QUIC stack now calculates\nand monitors memory overhead for every stream. The memory overhead\nfor a single stream frame is calculated as a difference between the\nsize of the whole packet that carries the stream frame and the size\nof the stream frame itself. The memory overhead for a single stream\nframe is added to the total (cumulative) memory overhead QUIC stack\nkeeps for each stream. Once the cumulative memory overhead exceeds\n64kB, the QUIC stack moves the stream frame data from the packet\nbuffer to the stream buffer, starting with the next packet received.\n\nFIPS impact: no\nThe FIPS module is not affected as the QUIC implementation is outside of\nthe OpenSSL FIPS module boundary.",
          "title": "Vulnerability description"
        }
      ],
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-54873"
        },
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          "summary": "https://github.com/openssl/openssl/commit/1f643b8bc735487b500a1f68a7fb3a22d5e38e23",
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          "url": "https://github.com/openssl/openssl/commit/3ea6213e050e938ecbbf8c4eff32bec2736780eb"
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          "summary": "https://github.com/openssl/openssl/commit/7127fb10888b49711c63128a09e524c0d2d5d0b2",
          "url": "https://github.com/openssl/openssl/commit/7127fb10888b49711c63128a09e524c0d2d5d0b2"
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          "summary": "https://openssl-library.org/news/secadv/20260929.txt",
          "url": "https://openssl-library.org/news/secadv/20260929.txt"
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      "release_date": "2026-09-29T16:17:00Z",
      "remediations": [
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          "date": "2026-10-04T21:39:03.307757Z",
          "details": "This issue is limited to deployments that explicitly enable and expose OpenSSL’s QUIC transport over UDP (e.g., UDP/443); classic TLS-over-TCP services are unaffected, and the impact is availability-only with no confidentiality or integrity risk (CVSS 5.3). Exploitation requires a remote peer to sustain QUIC connections and send crafted packets to hold packet buffers, but QUIC’s negotiated flow-control and stream-count limits inherently cap memory growth per connection, making the practical effect bounded resource pressure rather than systemic failure. With the upstream change that caps packet-buffer overhead to roughly 64 kB per stream and QUIC lying outside the FIPS module boundary, this can be safely deprioritized unless a QUIC listener is intentionally exposed to untrusted networks.",
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