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CVE-2026-27607

30
FAUCET Score

CVE-2026-27607 describes a critical vulnerability in RustFS versions 1.0.0-alpha.56 through 1.0.0-alpha.82, a distributed object storage system. The flaw allows attackers to bypass policy condition validation in presigned POST uploads, specifically content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads, potentially leading to storage exhaustion, arbitrary object key uploads, and content-type spoofing, with a CVSS score of 9.1 (CRITICAL). There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.0CPE matchmatch criteria
cpe:2.3:a:rustfs:rustfs:1.0.0:alpha56:*:*:*:rust:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:rustfs:rustfs:1.0.0:alpha57:*:*:*:rust:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:rustfs:rustfs:1.0.0:alpha58:*:*:*:rust:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:rustfs:rustfs:1.0.0:alpha59:*:*:*:rust:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:rustfs:rustfs:1.0.0:alpha60:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
18.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 1st percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

rustpatch availablevia ghsa
Product: rustfsFixed in: 1.0.0-alpha.83
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rustGHSA-w5fh-f8xh-5x3phigh

RustFS: Missing Post Policy Validation leads to Arbitrary Object Write

Feb 25, 2026

References

github.com / rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p
Vendor Advisory