{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-55737", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-17T10:44:34.365Z", "datePublished": "2026-07-27T15:13:54.699Z", "dateUpdated": "2026-07-28T09:55:26.434Z" }, "containers": { "cna": { "affected": [ { "cpes": [ "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "erlang", "external" ], "packageName": "erts", "packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "product": "OTP", "programFiles": [ "emulator/beam/external.c" ], "programRoutines": [ { "name": "erlang:binary_to_term/1" }, { "name": "erlang:binary_to_term/2" }, { "name": "dec_term" }, { "name": "decoded_size" } ], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [ { "changes": [ { "at": "17.0.4", "status": "unaffected" }, { "at": "16.4.0.4", "status": "unaffected" }, { "at": "15.2.7.11", "status": "unaffected" } ], "lessThan": "*", "status": "affected", "version": "13.0", "versionType": "otp" } ] }, { "collectionURL": "https://github.com", "cpes": [ "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "erlang", "external" ], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": [ "erts/emulator/beam/external.c" ], "programRoutines": [ { "name": "erlang:binary_to_term/1" }, { "name": "erlang:binary_to_term/2" }, { "name": "dec_term" }, { "name": "decoded_size" } ], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [ { "changes": [ { "at": "29.0.4", "status": "unaffected" }, { "at": "28.5.0.4", "status": "unaffected" }, { "at": "27.3.4.15", "status": "unaffected" } ], "lessThan": "*", "status": "affected", "version": "25.0", "versionType": "otp" }, { "lessThan": "c5210b42a9d3d96f3d25601942ce8122be0f3761", "status": "affected", "version": "ebcbb97b4ec223464cac3d94375739a248ddef6e", "versionType": "git" } ] } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "27.3.4.15", "versionStartIncluding": "25.0", "vulnerable": true }, { "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "28.5.0.4", "versionStartIncluding": "28.0", "vulnerable": true }, { "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "29.0.4", "versionStartIncluding": "29.0", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "AND" } ], "credits": [ { "lang": "en", "type": "finder", "value": "Nick Gunn" }, { "lang": "en", "type": "remediation developer", "value": "Kiko Fernandez-Reyes" }, { "lang": "en", "type": "remediation reviewer", "value": "Sverker Eriksson" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

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.

" } ], "value": "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." } ], "impacts": [ { "capecId": "CAPEC-92", "descriptions": [ { "lang": "en", "value": "CAPEC-92 Forced Integer Overflow" } ] } ], "metrics": [ { "cvssV4_0": { "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "baseScore": 5.1, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-195", "description": "CWE-195 Signed to Unsigned Conversion Error", "lang": "en", "type": "CWE" }, { "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-28T09:55:26.434Z" }, "references": [ { "tags": [ "vendor-advisory", "related" ], "url": "https://github.com/erlang/otp/security/advisories/GHSA-446w-268v-9462" }, { "tags": [ "related" ], "url": "https://cna.erlef.org/cves/CVE-2026-55737.html" }, { "tags": [ "related" ], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-55737" }, { "tags": [ "x_version-scheme" ], "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions" }, { "tags": [ "patch" ], "url": "https://github.com/erlang/otp/commit/c5210b42a9d3d96f3d25601942ce8122be0f3761" } ], "source": { "discovery": "EXTERNAL" }, "title": "Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts external term format decoder", "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-07-27T18:34:45.698069Z", "id": "CVE-2026-55737", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-27T18:34:55.080Z" } } ] } }