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CVE-2026-40344

MinIO is a high-performance object storage system. Starting in RELEASE.2023-05-18T00-05-36Z and prior to RELEASE.2026-04-11T03-20-12Z, an authentication bypass vulnerability in MinIO's Snowball auto-extract handler (`PutObjectExtractHandler`) allows any user who knows a valid access key to write arbitrary objects to any bucket without knowing the secret key or providing a valid cryptographic signature. Any MinIO deployment is impacted. The attack requires only a valid access key (the well-known
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6cacce36bb9dfc8c351db689a444dd85e9dafb56a7a638ef10ea6673298f124b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"minio","vendor":"minio","versions":[{"status":"affected","version":">= RELEASE.2023-05-18T00-05-36Z, < RELEASE.2026-04-11T03-20-12Z"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/minio/minio/commit/76913a9fd5c6e5c2dbd4e8c7faf56ed9e9e24091","tags":["x_refsource_MISC"],"url":"https://github.com/minio/minio/commit/76913a9fd5c6e5c2dbd4e8c7faf56ed9e9e24091"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/references/2
{"name":"https://github.com/minio/minio/pull/16484","tags":["x_refsource_MISC"],"url":"https://github.com/minio/minio/pull/16484"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/references/1
{"name":"https://github.com/minio/minio/security/advisories/GHSA-9c4q-hq6p-c237","tags":["x_refsource_CONFIRM"],"url":"https://github.com/minio/minio/security/advisories/GHSA-9c4q-hq6p-c237"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a50ff6ba2fc1ebef1accd4a862fd7e6e469ce3fbecf37cf9ff93ae5a79fdf439 · sha256:e07dc56f54fd069b… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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