Skip to content
Heist/ feed
UnratedFix available

UBUNTU-CVE-2026-55737

Type: advisorySource: OSV1 source record

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. When 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. This 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.

Announced Source revision 1
Original source ↗

UBUNTU-CVE-2026-55737

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-55737

erlang

Source reference: /affected/0/package/name

Affected versions
1:25.2.3+dfsg-1

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu1

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu3

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.1

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.2

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.3

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.4

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.5

Source reference: /affected/0/versions

1:25.3.2.8+dfsg-1ubuntu4.6

Source reference: /affected/0/versions

Fixed versions
1:25.3.2.8+dfsg-1ubuntu4.7

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

erlang

Source reference: /affected/1/package/name

Affected versions
1:27.3.4.1+dfsg-1build1

Source reference: /affected/1/versions

1:27.3.4.3+dfsg-1

Source reference: /affected/1/versions

1:27.3.4.4+dfsg-1

Source reference: /affected/1/versions

1:27.3.4.6+dfsg-1

Source reference: /affected/1/versions

Fixed versions
1:27.3.4.6+dfsg-1ubuntu0.1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:25.3.2.8+dfsg-1ubuntu4.7"
          }
        ]
      }
    ],
    "package": {
      "name": "erlang",
      "purl": "pkg:deb/ubuntu/erlang?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "1:25.2.3+dfsg-1",
      "1:25.3.2.8+dfsg-1",
      "1:25.3.2.8+dfsg-1ubuntu1",
      "1:25.3.2.8+dfsg-1ubuntu3",
      "1:25.3.2.8+dfsg-1ubuntu4",
      "1:25.3.2.8+dfsg-1ubuntu4.1",
      "1:25.3.2.8+dfsg-1ubuntu4.2",
      "1:25.3.2.8+dfsg-1ubuntu4.3",
      "1:25.3.2.8+dfsg-1ubuntu4.4",
      "1:25.3.2.8+dfsg-1ubuntu4.5",
      "1:25.3.2.8+dfsg-1ubuntu4.6"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55737.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "erlang",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-asn1",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-base",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-common-test",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-crypto",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-debugger",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-dialyzer",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-diameter",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-edoc",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-eldap",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-erl-docgen",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-et",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-eunit",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-examples",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-ftp",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-inets",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-jinterface",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-manpages",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-megaco",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-mnesia",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-mode",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-nox",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-observer",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-odbc",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-os-mon",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-parsetools",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-public-key",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-reltool",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-runtime-tools",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-snmp",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-src",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-ssh",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-ssl",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-syntax-tools",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-tftp",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-tools",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-wx",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-x11",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        },
        {
          "binary_name": "erlang-xmerl",
          "binary_version": "1:25.3.2.8+dfsg-1ubuntu4.7"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:27.3.4.6+dfsg-1ubuntu0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "erlang",
      "purl": "pkg:deb/ubuntu/erlang?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "1:27.3.4.1+dfsg-1build1",
      "1:27.3.4.3+dfsg-1",
      "1:27.3.4.4+dfsg-1",
      "1:27.3.4.6+dfsg-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55737.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "erlang",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-asn1",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-base",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-common-test",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-crypto",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-debugger",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-dialyzer",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-diameter",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-edoc",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-eldap",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-et",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-eunit",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-examples",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-ftp",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-inets",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-jinterface",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-megaco",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-mnesia",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-mode",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-nox",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-observer",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-odbc",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-os-mon",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-parsetools",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-public-key",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-reltool",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-runtime-tools",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-snmp",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-src",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-ssh",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-ssl",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-syntax-tools",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-tftp",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-tools",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-wx",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-x11",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        },
        {
          "binary_name": "erlang-xmerl",
          "binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#23709 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement