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CVE-2026-27607

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypass
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:aac488e3831357024ee6b00c608bc1835207c3d11833d67f4f52c4c61dfbf140
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-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"rustfs","vendor":"rustfs","versions":[{"status":"affected","version":">= 1.0.0-alpha.56, < 1.0.0-alpha.83"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3a83c96a37611f272dbe002862838ccf805176560b1df29127ac5ba622872112 · sha256:54a38ed2edc9efc1… · /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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