CVE-2026-88018

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Source
https://cve.org/CVERecord?id=CVE-2026-88018
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88018.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-88018
Aliases
Downstream
Published
2026-09-10T16:03:25Z
Modified
2026-09-12T03:47:21Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass
Details

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes3 then verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access key identifier as both the user and authentication value to the proxy without an independent per-identity secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is fixed in version 1.75.1.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-287",
        "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88018.json"
}
References

Affected packages

Git / github.com/rclone/rclone

Affected ranges

Type
GIT
Repo
https://github.com/rclone/rclone
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
90595f34f27f569be6b27c57fe5ab65057d323bd
Fixed
687d264b689b8c49a67e2e52a8a5e0caa01c04ce
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.75.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.90
v0.91
v0.92
v0.93
v0.94
v0.95
v0.96
v0.97
v0.98
v0.99
v1.*
v1.00
v1.01
v1.03
v1.04
v1.05
v1.06
v1.07
v1.08
v1.09
v1.10
v1.11
v1.12
v1.13
v1.14
v1.15
v1.16
v1.17
v1.18
v1.19
v1.20
v1.21
v1.22
v1.23
v1.24
v1.25
v1.26
v1.27
v1.28
v1.29
v1.29-1-gbb75d80
v1.30
v1.31
v1.32
v1.33
v1.34
v1.35
v1.36
v1.37
v1.38
v1.39
v1.40
v1.41
v1.42
v1.43
v1.44
v1.45
v1.46
v1.46.0
v1.47.0
v1.48.0
v1.49.0
v1.50.0
v1.51.0
v1.52.0
v1.53.0
v1.54.0
v1.55.0
v1.56.0
v1.57.0
v1.58.0
v1.59.0
v1.60.0
v1.61.0
v1.62.0
v1.63.0
v1.64.0
v1.65.0
v1.66.0
v1.67.0
v1.68.0
v1.69.0
v1.70.0
v1.71.0
v1.72.0
v1.73.0
v1.74.0
v1.75.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88018.json"