CVE-2026-39414
published 2026-04-08CVE-2026-39414: 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…
PriorityP338medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.48%
38.1th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | minio_minio | 0.0.0-20180815103019-7c14cdb60e53 – 0.0.0-20251203081239-27742d469462 | — |
| minio | minio | — | — |
| minio | minio | 2018-08-18t03-49-57z – 2025-10-15t17-29-55z | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv4.07.1HIGHCVSS: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
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GHSA
MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
ghsa·2026-04-09
CVE-2026-39414 [HIGH] CWE-770 MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
### Impact
_What kind of vulnerability is it? Who is impacted?_
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 decompre
OSV
MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
osv·2026-04-09
CVE-2026-39414 [HIGH] MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing
### Impact
_What kind of vulnerability is it? Who is impacted?_
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 decompre
No detection rules found.
No public exploits indexed.
2026-04-08
Published