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    "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/"
      }
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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"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: out-of-bounds read in decode_tag_internal()\n     - debian/patches/CVE-2026-63383.patch: bound the tag decoding loop by the\n       pulled-up length instead of the full buffer length in event_tagging.c\n     - CVE-2026-63383\n   * SECURITY UPDATE: integer overflow in evtag_unmarshal_header()\n     - debian/patches/CVE-2026-63384.patch: reject payload lengths above\n       INT_MAX in event_tagging.c, include/event2/tag.h\n     - CVE-2026-63384\n   * SECURITY UPDATE: heap out-of-bounds write in\n     bufferevent_socket_set_conn_address_() via an AF_UNIX peer address\n     - debian/patches/CVE-2026-63388.patch: check the address length\n       regardless of NDEBUG, fail the connection on an over-long address and\n       make conn_address large enough for AF_UNIX in bufferevent_sock.c,\n       bufferevent-internal.h, http.c\n     - CVE-2026-63388\n   * SECURITY UPDATE: off-by-one stack buffer overflow in dnsname_to_labels()\n     - debian/patches/CVE-2026-63387.patch: refuse to write the terminating\n       label byte past the end of the buffer in evdns.c\n     - CVE-2026-63387",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709490",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709490"
      },
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1790709490.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-29T19:19:29Z",
      "generator": {
        "date": "2026-09-29T19:19:29Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1790709490",
      "initial_release_date": "2026-09-29T19:19:29Z",
      "revision_history": [
        {
          "date": "2026-09-29T19:19:29Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-63383, CVE-2026-63384, CVE-2026-63387, CVE-2026-63388"
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    {
      "cve": "CVE-2026-63383",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
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          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63383"
        },
        {
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          "summary": "https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321",
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          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
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          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
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          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6",
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          "date": "2026-09-29T19:18:12.381217Z",
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        "name": "Integer Overflow or Wraparound"
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          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT_MAX become negative or truncated, and evtag_unmarshal_string can use the converted value in allocation sizing, producing a wrapped large allocation request and denial of service. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
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        "name": "Reachable Assertion"
      },
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          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
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          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338",
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          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709490"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63387",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
          "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
          "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.armel",
          "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
          "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
          "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
          "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
          "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63387"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47"
        }
      ],
      "release_date": "2026-08-20T18:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-29T19:18:12.381217Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790709490",
          "product_ids": [
            "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
            "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-core-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
            "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-dev-0:2.1.12-stable-1+tuxcare.els1.armel",
            "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-extra-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
            "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-openssl-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel",
            "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.amd64",
            "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.arm64",
            "Debian-11:libevent-pthreads-2.1-7-0:2.1.12-stable-1+tuxcare.els1.armel"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709490"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}