CVE-2026-88018: rclone is a command-line program to sync files and directories to and from different cloud storage providers

Q: How do I fix CVE-2026-88018?

rclone: upgrade to 1.75.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-88018 being exploited?

CVE-2026-88018 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-88018 affect?

CVE-2026-88018 affects rclone. Severity is critical (CVSS 9.8). 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 cli

Q: How urgent is CVE-2026-88018?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-88018 is a critical-severity flaw (CVSS 9.8) affecting rclone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 aut

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-287, CWE-306
Published	2026-09-10
Last modified	2026-09-14

Publisher (CNA): GitHub, Inc. · Vendor: rclone

Last updated 2026-09-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 16:18 UTCPublished CVE record published
2026-09-14 20:01 UTCUpdated Record last modified

rclone rclone UPGRADE

Affected: < 1.75.1

Fixed in: 1.75.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rclone || rpm -q rclone || rclone --version

2. UPGRADE to 1.75.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rclone

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rclone

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-88018?

rclone: upgrade to 1.75.1. Exact commands for each OS are on this page.

Is CVE-2026-88018 being exploited?

CVE-2026-88018 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-88018 affect?

CVE-2026-88018 affects rclone. Severity is critical (CVSS 9.8). 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 cli

How urgent is CVE-2026-88018?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-88015 MEDIUM 5.3 UPGRADE rclone is a command-line program to sync files and directories to and from different cloud storage providers
CVE-2026-88014 MEDIUM 6.3 UPGRADE rclone is a command-line program to sync files and directories to and from different cloud storage providers
CVE-2026-88013 LOW 3.7 UPGRADE rclone is a command-line program to sync files and directories to and from different cloud storage providers
CVE-2026-88016 HIGH 7.1 UPGRADE rclone is a command-line program to sync files and directories to and from different cloud storage providers
CVE-2026-88017 HIGH 7.3 UPGRADE rclone is a command-line program to sync files and directories to and from different cloud storage providers

References

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