CVE-2026-39414

HIGH EPSS 38.1%
Published Apr 8, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 4.0
High
Find Similar
Published Apr 8, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
38.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 1

VendorProductVersionRange
miniominio*≥2018-08-18t03-49-57z  –  ≤2025-10-15t17-29-55z

References 4

  • docs.min.io https://docs.min.io/enterprise/aistor-object-store/upgrade-aistor-server/community-edition
    Product
  • github.com https://github.com/minio/minio/commit/7c14cdb60e53dbfdad2be644dfb180cab19fffa7
    Patch
  • github.com https://github.com/minio/minio/pull/8200
    Patch
  • github.com https://github.com/minio/minio/security/advisories/GHSA-h749-fxx7-pwpg
    Vendor Advisory

Remediation

  • github.com https://github.com/minio/minio/commit/7c14cdb60e53dbfdad2be644dfb180cab19fffa7
    Patch
  • github.com https://github.com/minio/minio/pull/8200
    Patch