{"id":"CVE-2026-39414","sourceIdentifier":"security-advisories@github.com","published":"2026-04-08T21:16:58.877","lastModified":"2026-07-24T21:10:00.143","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"MinIO is a high-performance object storage system. From RELEASE.2018-08-18T03-49-57Z to before RELEASE.2025-12-20T04-58-37Z, MinIO's S3 Select feature is vulnerable to memory exhaustion when processing CSV files containing lines longer than available memory. The CSV reader's nextSplit() function calls bufio.Reader.ReadBytes('\\n') with no size limit, buffering the entire input in memory until a newline is found. A CSV file with no newline characters causes the entire contents to be read into a single allocation, leading to an OOM crash of the MinIO server process. This is exploitable by any authenticated user with s3:PutObject and s3:GetObject permissions. The attack is especially practical when combined with compression: a ~2 MB gzip-compressed CSV can decompress to gigabytes of data without newlines, allowing a small upload to cause large memory consumption on the server. However, compression is not required — a sufficiently large uncompressed CSV with no newlines triggers the same issue."},{"lang":"es","value":"MinIO es un sistema de almacenamiento de objetos de alto rendimiento. Desde RELEASE.2018-08-18T03-49-57Z hasta antes de RELEASE.2025-12-20T04-58-37Z, la característica S3 Select de MinIO es vulnerable al agotamiento de memoria al procesar archivos CSV que contienen líneas más largas que la memoria disponible. La función nextSplit() del lector de CSV llama a bufio.Reader.ReadBytes('\\n') sin límite de tamaño, almacenando en búfer toda la entrada en memoria hasta que se encuentra un salto de línea. Un archivo CSV sin caracteres de salto de línea hace que todo el contenido se lea en una única asignación, lo que lleva a un fallo por OOM del proceso del servidor MinIO. Esto es explotable por cualquier usuario autenticado con permisos s3:PutObject y s3:GetObject. El ataque es especialmente práctico cuando se combina con compresión: un CSV comprimido con gzip de ~2 MB puede descomprimirse a gigabytes de datos sin saltos de línea, permitiendo que una pequeña carga cause un gran consumo de memoria en el servidor. Sin embargo, la compresión no es necesaria - un CSV sin comprimir suficientemente grande y sin saltos de línea desencadena el mismo problema."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"minio","product":"minio","versions":[{"version":">= RELEASE.2018-08-18T03-49-57Z, < RELEASE.2025-12-20T04-58-37Z","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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":7.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","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:L/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-09T14:57:40.322565Z","id":"CVE-2026-39414","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-770"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*","versionStartIncluding":"2018-08-18t03-49-57z","versionEndIncluding":"2025-10-15t17-29-55z","matchCriteriaId":"AAB60BDE-9136-44FF-AEC2-C00F76E8BB05"}]}]}],"references":[{"url":"https://docs.min.io/enterprise/aistor-object-store/upgrade-aistor-server/community-edition","source":"security-advisories@github.com","tags":["Product"]},{"url":"https://github.com/minio/minio/commit/7c14cdb60e53dbfdad2be644dfb180cab19fffa7","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/minio/minio/pull/8200","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/minio/minio/security/advisories/GHSA-h749-fxx7-pwpg","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}