{"id":"UBUNTU-CVE-2026-54890","details":"Integer Underflow (Wrap or Wraparound) vulnerability in erlang otp erlang/otp (erts modules), erlang otp erts (erts modules) allows Forced Integer Overflow, Excessive Allocation. This vulnerability is associated with program files erts/emulator/beam/external.c, emulator/beam/external.c. The BIT_BINARY_EXT tag (77) handler in the External Term Format (ETF) decoder accepts an encoding with both length and trailing-bits fields set to zero. The subsequent computation of the bitstring size underflows an unsigned integer, producing a value of roughly 2^64 that is then passed as a memory allocation size. The allocator aborts the entire node with a message such as \"Cannot allocate 2305843009213693951 bytes of memory (of type binary)\". The crash is a VM-level abort, not an Erlang-level exception. It cannot be intercepted by supervision trees, by try/catch, or by passing the [safe] option to binary_to_term/2 (which only restricts atom creation and does not perform structural validation of binary encodings). Any application that decodes ETF from untrusted sources via binary_to_term/1,2 or enif_binary_to_term() is exposed. The Erlang distribution protocol also decodes incoming terms through the same code path, but distribution is expected to run on trusted networks per the OTP Secure Coding Guidelines (DSG-011). This issue affects OTP from OTP 27.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to erts from 15.0 before 17.0.4, 16.4.0.4 and 15.2.7.11.","modified":"2026-09-22T22:56:19.581109334Z","published":"2026-07-27T16:17:00Z","upstream":["CVE-2026-54890"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-54890"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-54890"}],"affected":[{"package":{"name":"erlang","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/erlang?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-asn1","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-base","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-common-test","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-crypto"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-debugger"},{"binary_name":"erlang-dialyzer","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-diameter","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-edoc","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-eldap","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-et","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-eunit"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-examples"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-ftp"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-inets"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-jinterface"},{"binary_name":"erlang-megaco","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-mnesia"},{"binary_name":"erlang-mode","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-nox","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-observer","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-odbc","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-os-mon","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-parsetools","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-public-key","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-reltool","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-runtime-tools","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-snmp","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-src","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-ssh","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-ssl","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-syntax-tools","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-tftp","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_name":"erlang-tools","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-wx"},{"binary_name":"erlang-x11","binary_version":"1:27.3.4.6+dfsg-1"},{"binary_version":"1:27.3.4.6+dfsg-1","binary_name":"erlang-xmerl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54890.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}