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CVE

CVE-2026-27607

RustFS's Missing Post Policy Validation leads to Arbitrary Object Write
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CVE

CVE-2026-27607

RustFS's Missing Post Policy Validation leads to Arbitrary Object Write

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 bypasses. Version 1.0.0-alpha.83 fixes the issue.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27607.json, https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p, https://nvd.nist.gov/vuln/detail/CVE-2026-27607

Severity

8.1

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.1
EPSS Probability
0.00122%
EPSS Percentile
0.30778%
Introduced Version
3f717292bf69a6cf5fffa0e41253fd1ce08ec5cb
Fix Available
9824171995b58da071c18b5243299bc69e6ec4a7

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