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CVE-2026-49991

RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning reso
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:af109d4e6791f3a34c832804369e1c7c5858aa2c6decec19f721feff9fa279be
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-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"rustfs","vendor":"rustfs","versions":[{"status":"affected","version":"1.0.0-beta.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /containers/adp/0/references/0
{"name":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:60981aa51dca10ae9b9d4062bc087306923e2e1e092b9bb3a7298e0172ec8782 · sha256:84a1909a659dd055… · /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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