{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c5210b42a9d3d96f3d25601942ce8122be0f3761"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-446w-268v-9462"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-195",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55737.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "13.0"
          },
          {
            "fixed": "*"
          },
          {
            "introduced": "25.0"
          },
          {
            "fixed": "*"
          },
          {
            "introduced": "ebcbb97b4ec223464cac3d94375739a248ddef6e"
          },
          {
            "fixed": "c5210b42a9d3d96f3d25601942ce8122be0f3761"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "25.0"
          },
          {
            "fixed": "27.3.4.15"
          },
          {
            "introduced": "28.0"
          },
          {
            "fixed": "28.5.0.4"
          },
          {
            "introduced": "29.0"
          },
          {
            "fixed": "29.0.4"
          }
        ],
        "source": "CPE_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "25.0"
          },
          {
            "introduced": "13.0"
          },
          {
            "fixed": "17.0.4"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Signed to Unsigned Conversion Error and Out-of-bounds Write vulnerability in Erlang OTP erts allows an attacker who can supply a crafted Erlang external term format (ETF) binary to binary_to_term/1 to corrupt the BEAM heap pointer and crash the virtual machine.\n\nWhen decoding a LARGE_TUPLE_EXT term, the validation pass decoded_size() in erts/emulator/beam/external.c reads the 32-bit arity field as unsigned (get_uint32()), while the decode pass dec_term() reads the same field as a signed 32-bit integer (get_int32()) into an int. An arity wire value of 0x80000000 passes validation as 2147483648 but decodes as -2147483648, so the subsequent hp += n moves the heap allocation pointer backward. Neither pass enforces the runtime tuple-arity limit MAX_ARITYVAL. The result is an out-of-bounds heap write; in practice the VM detects an impossible heap size and aborts, denying service. The required padding is large when uncompressed but the compressed-ETF envelope shrinks it to a small payload on the wire.\n\nThis issue affects OTP from OTP 25.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to erts from 13.0 before 17.0.4, 16.4.0.4 and 15.2.7.11.",
  "id": "CVE-2026-55737",
  "modified": "2026-07-29T03:30:18.839920469Z",
  "published": "2026-07-27T15:13:54.699Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-55737.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-55737"
    },
    {
      "type": "WEB",
      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55737.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/erlang/otp/security/advisories/GHSA-446w-268v-9462"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55737"
    },
    {
      "type": "FIX",
      "url": "https://github.com/erlang/otp/commit/c5210b42a9d3d96f3d25601942ce8122be0f3761"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/erlang/otp"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts external term format decoder"
}