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        "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.",
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        "id": "CWE-407",
        "name": "Inefficient Algorithmic Complexity"
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        {
          "category": "description",
          "text": "Issue summary: The QUIC stream reassembly algorithm performance deteriorates\nprogressively as packets are arriving out of order. The worst case has\na quadratic complexity proportional to the number of stream frames kept in\nthe buffer for the received stream data.\n\nImpact summary: A remote QUIC peer that completes the handshake can create\na connection-scoped CPU pressure and potentially a Denial of Service using\ncompliant STREAM frames inside the advertised receive window, with low\nattacker bandwidth.\n\nCWE: CWE-407: Inefficient Algorithmic Complexity\n\nDescription: OpenSSL manages received QUIC stream fragments using a\ndoubly-linked list. While it optimizes for append operations (at the end of\nthe list), it falls back to a head-to-tail linear search for any fragment\nthat does not immediately follow the current `tail`.\n\nBy manipulating the sequence of offsets, an attacker can force the server\nto perform O(n^2) operations, consuming excessive CPU time for the\nQUIC process.\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"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-42772"
        },
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          "summary": "https://github.com/openssl/openssl/commit/32d0ed8afe1b8c3e7ece725b44663da3d7087a09",
          "url": "https://github.com/openssl/openssl/commit/32d0ed8afe1b8c3e7ece725b44663da3d7087a09"
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          "summary": "https://github.com/openssl/openssl/commit/ca8402e273af4de5b3f04fa61a0f0c02ce3ae20e",
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        },
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          "summary": "https://github.com/openssl/openssl/commit/eb2becc0a4baea7f3050a247834d0e5c2ebe1773",
          "url": "https://github.com/openssl/openssl/commit/eb2becc0a4baea7f3050a247834d0e5c2ebe1773"
        },
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          "summary": "https://github.com/openssl/openssl/commit/f42ae513bbda513b3c121d54834040ee4a0eae1a",
          "url": "https://github.com/openssl/openssl/commit/f42ae513bbda513b3c121d54834040ee4a0eae1a"
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        {
          "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": "2026-09-29T16:17:00Z",
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        },
        {
          "category": "impact",
          "date": "2026-10-15T17:35:20.939098Z",
          "details": "The openssl package for Debian 11 ELS is not affected by CVE-2026-42772. The flaw is in the QUIC stream reassembly implementation introduced in OpenSSL 3.4 and later, while the shipped version is 1.1.1w, which the OpenSSL advisory lists as not affected and which contains no QUIC implementation.",
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            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.armel",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.armel",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els3.amd64",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els3.arm64",
            "Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els3.armel"
          ]
        }
      ]
    }
  ]
}