CVE-2026-39414: MinIO is a high-performance object storage system

Routine

MEDIUM 6.5UPGRADE

CVE-2026-39414 is a medium-severity flaw (CVSS 6.5) affecting minio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 characte

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: minio

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 21:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

minio minio UPGRADE

Affected: >= 2018-08-18t03-49-57z and <= 2025-10-15t17-29-55z

Fixed in: newer than 2025-10-15t17-29-55z

Safe to downgrade to: a release before 2018-08-18t03-49-57z

1. Check installed version

apt-cache policy minio || rpm -q minio || minio --version

2. UPGRADE to newer than 2025-10-15t17-29-55z (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade minio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade minio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2018-08-18t03-49-57z (Debian / Ubuntu)

apt-cache madison minio sudo apt install minio=<VERSION_BEFORE_2018-08-18t03-49-57z> sudo apt-mark hold minio

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list minio sudo dnf downgrade minio-<VERSION_BEFORE_2018-08-18t03-49-57z> sudo dnf versionlock add minio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39414?

minio: upgrade to newer than 2025-10-15t17-29-55z. Exact commands for each OS are on this page.

Is CVE-2026-39414 being exploited?

CVE-2026-39414 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39414 affect?

CVE-2026-39414 affects minio. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-39414?

Priority 33/100. No elevated risk signals yet.

Software pages

MinIO vulnerabilities

Related CVEs

CVE-2026-42600 MEDIUM 4.9 UPGRADE MinIO is a high-performance object storage system
CVE-2026-41145 HIGH 8.2 UPGRADE MinIO is a high-performance object storage system
CVE-2026-40344 HIGH 8.2 UPGRADE MinIO is a high-performance object storage system
CVE-2026-33419 HIGH 7.5 UPGRADE MinIO is a high-performance object storage system
CVE-2026-33322 CRITICAL 9.8 UPGRADE MinIO is a high-performance object storage system

References

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