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  4. CVE 2026 39414 minio affected a dos via unbounded memory
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-39414GHSA-H749-FXX7-PWPG

MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing in github.com/minio/minioCVE-2026-39414

Answer in brief

CVE-2026-39414 records a Unknown severity vulnerability in MinIO affected a DoS via Unbounded Memory Allocation in S3 Select CSV Parsing in github.com/minio/minio. The current sources do not mark it as known exploited. The current feed maps github.com/minio/minio (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 9, 2026Updated Oct 8, 2026Source checked Oct 8, 2026First seen by HOL Oct 8, 2026Material review Oct 8, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
OSV
Source checked
Oct 8, 2026
References
7 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps github.com/minio/minio (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
github.com/minio/miniogo>=0.0.0-20180815103019-7c14cdb60e53Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for github.com/minio/minio.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Apr 9, 2026

    Evidence: source:osv:source_dates:source-dates:record

  2. Source modified

    Oct 8, 2026

    Evidence: source:osv:source_dates:source-dates:record

  3. First seen by HOL

    Oct 8, 2026

Sources and claim methodology

  • Source referencedocs.min.io
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • Source referencepkg.go.dev
Upstream source description

### 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 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 component:** `internal/s3select/csv/reader.go`, function `nextSplit()`. **CWE:** CWE-770 (Allocation of Resources Without Limits or Throttling) ### Affected Versions All MinIO releases are through the final release of the minio/minio open-source project. The vulnerability was introduced in commit https://github.com/minio/minio/commit/7c14cdb60e53dbfdad2be644dfb180cab19fffa7, which added S3 Select support for CSV. The CSV reader has used unbounded line reads since this commit (originally via Go's stdlib `encoding/csv.Reader`, later via `bufio.Reader.ReadBytes` after a refactor in [PR #8200](https://github.com/minio/minio/pull/8200). The first affected release is `RELEASE.2018-08-18T03-49-57Z`. ### Patches **Fixed in**: MinIO AIStor RELEASE.2025-12-20T04-58-37Z The fix replaces the unbounded `bufio.Reader.ReadBytes('\n')` call with a byte-at-a-time loop that caps line scanning at 128 KB (`csvSplitSize`). If no newline is found within this limit, the reader returns an error instead of continuing to buffer. #### Binary Downloads | Platform | Architecture | Download | | -------- | ------------ | --------------------------------------------------------------------------- | | Linux | amd64 | [minio](https://dl.min.io/aistor/minio/release/linux-amd64/minio) | | Linux | arm64 | [minio](https://dl.min.io/aistor/minio/release/linux-arm64/minio) | | macOS | arm64 | [minio](https://dl.min.io/aistor/minio/release/darwin-arm64/minio) | | macOS | amd64 | [minio](https://dl.min.io/aistor/minio/release/darwin-amd64/minio) | | Windows | amd64 | [minio.exe](https://dl.min.io/aistor/minio/release/windows-amd64/minio.exe) | #### FIPS Binaries | Platform | Architecture | Download | | -------- | ------------ | --------------------------------------------------------------------------- | | Linux | amd64 | [minio.fips](https://dl.min.io/aistor/minio/release/linux-amd64/minio.fips) | | Linux | arm64 | [minio.fips](https://dl.min.io/aistor/minio/release/linux-arm64/minio.fips) | #### Package Downloads | Format | Architecture | Download | | ------ | ------------ | ----------------------------------------------------------------------------------------------------------------------------------- | | DEB | amd64 | [minio_20251220045837.0.0_amd64.deb](https://dl.min.io/aistor/minio/release/linux-amd64/minio_20251220045837.0.0_amd64.deb) | | DEB | arm64 | [minio_20251220045837.0.0_arm64.deb](https://dl.min.io/aistor/minio/release/linux-arm64/minio_20251220045837.0.0_arm64.deb) | | RPM | amd64 | [minio-20251220045837.0.0-1.x86_64.rpm](https://dl.min.io/aistor/minio/release/linux-amd64/minio-20251220045837.0.0-1.x86_64.rpm) | | RPM | arm64 | [minio-20251220045837.0.0-1.aarch64.rpm](https://dl.min.io/aistor/minio/release/linux-arm64/minio-20251220045837.0.0-1.aarch64.rpm) | #### Container Images ```bash # Standard docker pull quay.io/minio/aistor/minio:RELEASE.2025-12-20T04-58-37Z podman pull quay.io/minio/aistor/minio:RELEASE.2025-12-20T04-58-37Z # FIPS docker pull quay.io/minio/aistor/minio:RELEASE.2025-12-20T04-58-37Z.fips podman pull quay.io/minio/aistor/minio:RELEASE.2025-12-20T04-58-37Z.fips ``` #### Homebrew (macOS) ```bash brew install minio/aistor/minio ``` ### Workarounds - [Users of the open-source `minio/minio` project should upgrade to MinIO AIStor `RELEASE.2025-12-20T04-58-37Z` or later.](https://docs.min.io/enterprise/aistor-object-store/upgrade-aistor-server/community-edition/) If upgrading is not immediately possible: - **Disable S3 Select access via IAM policy.** Deny the `s3:GetObject` action with a condition restricting `s3:prefix` on sensitive buckets, or more specifically, deny `SelectObjectContent` requests at a reverse proxy by blocking `POST` requests with `?select&select-type=2` query parameters. - **Restrict PutObject permissions.** Limit `s3:PutObject` grants to trusted principals to reduce the attack surface. Note: this reduces risk but does not eliminate the vulnerability since any authorized user can exploit it. ### References - Introducing commit: [`7c14cdb60`](https://github.com/minio/minio/commit/7c14cdb60e53dbfdad2be644dfb180cab19fffa7) ([PR #6127](https://github.com/minio/minio/pull/6127)) - [MinIO AIStor](https://min.io/aistor)

Quoted source text, attributed separately from HOL analysis.