CVE-2026-55737

{"id": "CVE-2026-55737", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55737", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-27T18:34:45.698069Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.1, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["erlang", "external"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "17.0.4", "status": "unaffected"}, {"at": "16.4.0.4", "status": "unaffected"}, {"at": "15.2.7.11", "status": "unaffected"}], "version": "13.0", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "packageName": "erts", "programFiles": ["emulator/beam/external.c"], "defaultStatus": "unaffected", "programRoutines": [{"name": "erlang:binary_to_term/1"}, {"name": "erlang:binary_to_term/2"}, {"name": "dec_term"}, {"name": "decoded_size"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["erlang", "external"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "29.0.4", "status": "unaffected"}, {"at": "28.5.0.4", "status": "unaffected"}, {"at": "27.3.4.15", "status": "unaffected"}], "version": "25.0", "lessThan": "*", "versionType": "otp"}, {"status": "affected", "version": "ebcbb97b4ec223464cac3d94375739a248ddef6e", "lessThan": "c5210b42a9d3d96f3d25601942ce8122be0f3761", "versionType": "git"}], "packageURL": "pkg:github/erlang/otp", "packageName": "erlang/otp", "programFiles": ["erts/emulator/beam/external.c"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "erlang:binary_to_term/1"}, {"name": "erlang:binary_to_term/2"}, {"name": "dec_term"}, {"name": "decoded_size"}]}]}], "published": "2026-07-27T16:17:48.847", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-55737.html", "tags": ["Patch", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/erlang/otp/commit/c5210b42a9d3d96f3d25601942ce8122be0f3761", "tags": ["Patch"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/erlang/otp/security/advisories/GHSA-446w-268v-9462", "tags": ["Vendor Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-55737", "tags": ["Patch", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions", "tags": ["Release Notes"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-195"}, {"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "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\u00a029.0.4, OTP\u00a028.5.0.4 and OTP\u00a027.3.4.15, corresponding to erts from 13.0 before 17.0.4, 16.4.0.4 and 15.2.7.11."}, {"lang": "es", "value": "La vulnerabilidad de error de conversi\u00f3n de firmado a no firmado y escritura fuera de l\u00edmites en Erlang OTP erts permite a un atacante que puede proporcionar un binario de formato de t\u00e9rmino externo (ETF) de Erlang manipulado a binary_to_term/1 corromper el puntero del mont\u00f3n de BEAM y bloquear la m\u00e1quina virtual.\n\nAl decodificar un t\u00e9rmino LARGE_TUPLE_EXT, el paso de validaci\u00f3n decoded_size() en erts/emulator/beam/external.c lee el campo de aridad de 32 bits como no firmado (get_uint32()), mientras que el paso de decodificaci\u00f3n dec_term() lee el mismo campo como un entero firmado de 32 bits (get_int32()) en un int. Un valor de aridad en la red de 0x80000000 pasa la validaci\u00f3n como 2147483648 pero decodifica como -2147483648, por lo que el hp += n subsiguiente mueve el puntero de asignaci\u00f3n del mont\u00f3n hacia atr\u00e1s. Ninguno de los pasos aplica el l\u00edmite de aridad de tupla en tiempo de ejecuci\u00f3n MAX_ARITYVAL. El resultado es una escritura fuera de l\u00edmites en el mont\u00f3n; en la pr\u00e1ctica, la MV detecta un tama\u00f1o de mont\u00f3n imposible y aborta, denegando el servicio. El relleno requerido es grande cuando no est\u00e1 comprimido, pero la envoltura ETF comprimida lo reduce a una peque\u00f1a carga \u00fatil en la red.\n\nEste problema afecta a OTP desde OTP 25.0 antes de OTP 29.0.4, OTP 28.5.0.4 y OTP 27.3.4.15, correspondiente a erts desde 13.0 antes de 17.0.4, 16.4.0.4 y 15.2.7.11."}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA31D517-2243-46BE-AD40-106BBD8997CF", "versionEndExcluding": "27.3.4.15", "versionStartIncluding": "25.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E5A403B9-F8C0-42F9-9CDD-AE95FBBA58BC", "versionEndExcluding": "28.5.0.4", "versionStartIncluding": "28.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4325E198-43FA-4DD1-99A5-66705CF21615", "versionEndExcluding": "29.0.4", "versionStartIncluding": "29.0"}, {"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "921D6395-EE4B-4E7E-AED8-BD77752A0C9E", "versionEndExcluding": "15.2.7.11", "versionStartIncluding": "13.0"}, {"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "31D9076A-4078-4597-A518-12B6E55007B8", "versionEndExcluding": "16.4.0.4", "versionStartIncluding": "16.0"}, {"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7EC53F68-5A92-4EF5-8789-1905C50D85BF", "versionEndExcluding": "17.0.4", "versionStartIncluding": "17.0"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}