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CVE-2026-39414— MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing

Quick assessment

Affected
minio minio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2018-08-18T03-49-57Z至RELEASE.2025-12-20T04-58-37Z之前版本存在安全漏洞，该漏洞源于处理包含超长行的CSV文件时存在内存耗尽问题，可能导致服务器进程因内存不足而崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.56% · P45
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I. Basic Information for CVE-2026-39414

Vulnerability Information
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Vulnerability Title
MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
MinIO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2018-08-18T03-49-57Z至RELEASE.2025-12-20T04-58-37Z之前版本存在安全漏洞，该漏洞源于处理包含超长行的CSV文件时存在内存耗尽问题，可能导致服务器进程因内存不足而崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
minio minio >= RELEASE.2018-08-18T03-49-57Z, < RELEASE.2025-12-20T04-58-37Z -

II. Public POCs for CVE-2026-39414

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III. Intelligence Information for CVE-2026-39414

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Vendor Advisories for CVE-2026-39414 (1)

IV. Related Vulnerabilities

Same product: minio
Same vendor: minio
Same weakness: CWE-770

V. Comments for CVE-2026-39414

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