{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-23943",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23943",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-03-13T09:11:57.794Z",
    "updatedAt": "2026-07-24T14:15:38.635Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Pre-auth SSH DoS via unbounded zlib inflate",
      "summary": "Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion.\n\nThe SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS.\n\nTwo compression algorithms are affected:\n\n* zlib: Activates immediately after key exchange, enabling unauthenticated attacks\n* zlib@openssh.com: Activates post-authentication, enabling authenticated attacks\n\nEach SSH packet can decompress ~255 MB from 256 KB of wire data (1029:1 amplification ratio). Multiple packets can rapidly exhaust available memory, causing OOM kills in memory-constrained environments.\n\nThis vulnerability is associated with program files lib/ssh/src/ssh_transport.erl and program routines ssh_transport:decompress/2, ssh_transport:handle_packet_part/4.\n\nThis issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 before 5.5.1, 5.2.11.6 and 5.1.4.14.",
      "affected": [
        {
          "vendor": "Erlang",
          "product": "OTP",
          "packageName": "ssh",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "3.0.1",
              "status": "affected",
              "versionType": "otp",
              "lessThan": "*",
              "changes": [
                {
                  "at": "5.5.1",
                  "status": "unaffected"
                },
                {
                  "at": "5.2.11.6",
                  "status": "unaffected"
                },
                {
                  "at": "5.1.4.14",
                  "status": "unaffected"
                }
              ]
            }
          ]
        },
        {
          "vendor": "Erlang",
          "product": "OTP",
          "packageName": "erlang/otp",
          "collectionURL": "https://github.com",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "17.0",
              "status": "affected",
              "versionType": "otp",
              "lessThan": "*",
              "changes": [
                {
                  "at": "28.4.1",
                  "status": "unaffected"
                },
                {
                  "at": "27.3.4.9",
                  "status": "unaffected"
                },
                {
                  "at": "26.2.5.18",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "07b8f441ca711f9812fad9e9115bab3c3aa92f79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "*",
              "changes": [
                {
                  "at": "43a87b949bdff12d629a8c34146711d9da93b1b1",
                  "status": "unaffected"
                },
                {
                  "at": "93073c3bd338c60cd2bae715ce6a1d4ffc1a8fd3",
                  "status": "unaffected"
                },
                {
                  "at": "0c1c04b191f6ab940e8fcfabce39eb5a8a6440a4",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  }
}