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CVE-2026-42882

oxyno-zeta/s3-proxy is an aws s3 proxy written in go. Prior to 5.0.0, s3-proxy contains an authentication bypass caused by inconsistent URL path interpretation between the authentication middleware and the bucket handler. The authentication middleware evaluates resource path patterns against the percent-encoded request URI (r.URL.RequestURI()), while the bucket handler constructs S3 object keys from the decoded path (r.URL.Path). This mismatch, combined with the glob library being invoked withou
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fc0e3752390990d2669cb53c9692dceef1681360a1daf21d424e3cbd1c01d96f
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-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:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /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:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"s3-proxy","vendor":"oxyno-zeta","versions":[{"status":"affected","version":"< 5.0.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.4,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"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:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /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:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/oxyno-zeta/s3-proxy/commit/1320e4abd46ad18c2851fedde50dbb79df8b7a51","tags":["x_refsource_MISC"],"url":"https://github.com/oxyno-zeta/s3-proxy/commit/1320e4abd46ad18c2851fedde50dbb79df8b7a51"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/references/1
{"name":"https://github.com/oxyno-zeta/s3-proxy/commit/af5ff57d8c6022459495b8fb50130073bca7b48a","tags":["x_refsource_MISC"],"url":"https://github.com/oxyno-zeta/s3-proxy/commit/af5ff57d8c6022459495b8fb50130073bca7b48a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/references/2
{"name":"https://github.com/oxyno-zeta/s3-proxy/security/advisories/GHSA-rfgq-wgg8-662p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/oxyno-zeta/s3-proxy/security/advisories/GHSA-rfgq-wgg8-662p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/oxyno-zeta/s3-proxy/security/advisories/GHSA-rfgq-wgg8-662p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:513c93786dd1124dc3374a4eb46e3a361e94c1e3fc7250835ec83b7a8672e096 · sha256:6ed4ef29d5d1a315… · /containers/adp/0/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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