{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-55737","sourceIdentifier":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","published":"2026-07-27T16:17:48.847","lastModified":"2026-10-24T13:10:00.147","vulnStatus":"Analyzed","cveTags":[],"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 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."},{"lang":"es","value":"La vulnerabilidad de error de conversión de firmado a no firmado y escritura fuera de límites en Erlang OTP erts permite a un atacante que puede proporcionar un binario de formato de término externo (ETF) de Erlang manipulado a binary_to_term/1 corromper el puntero del montón de BEAM y bloquear la máquina virtual.\n\nAl decodificar un término LARGE_TUPLE_EXT, el paso de validación 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 decodificación 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 validación como 2147483648 pero decodifica como -2147483648, por lo que el hp += n subsiguiente mueve el puntero de asignación del montón hacia atrás. Ninguno de los pasos aplica el límite de aridad de tupla en tiempo de ejecución MAX_ARITYVAL. El resultado es una escritura fuera de límites en el montón; en la práctica, la MV detecta un tamaño de montón imposible y aborta, denegando el servicio. El relleno requerido es grande cuando no está comprimido, pero la envoltura ETF comprimida lo reduce a una pequeña carga útil 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."}],"affected":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","affectedData":[{"vendor":"Erlang","product":"OTP","defaultStatus":"unaffected","packageName":"erts","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"modules":["erlang","external"],"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","packageURL":"pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","versions":[{"version":"13.0","lessThan":"*","versionType":"otp","status":"affected","changes":[{"at":"17.0.4","status":"unaffected"},{"at":"16.4.0.4","status":"unaffected"},{"at":"15.2.7.11","status":"unaffected"}]}]},{"vendor":"Erlang","product":"OTP","defaultStatus":"unaffected","collectionURL":"https://github.com","packageName":"erlang/otp","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"modules":["erlang","external"],"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","packageURL":"pkg:github/erlang/otp","versions":[{"version":"25.0","lessThan":"*","versionType":"otp","status":"affected","changes":[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]},{"version":"ebcbb97b4ec223464cac3d94375739a248ddef6e","lessThan":"c5210b42a9d3d96f3d25601942ce8122be0f3761","versionType":"git","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary","cvssData":{"version":"4.0","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","baseScore":5.1,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-27T18:34:45.698069Z","id":"CVE-2026-55737","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA 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Party Advisory"]},{"url":"https://github.com/erlang/otp/commit/c5210b42a9d3d96f3d25601942ce8122be0f3761","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Patch"]},{"url":"https://github.com/erlang/otp/security/advisories/GHSA-446w-268v-9462","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Vendor Advisory"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-55737","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Patch","Third Party Advisory"]},{"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Release Notes"]}]}}