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[USN-8867-1] Ceph vulnerability

Posted on 05 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8867-1
October 05, 2026

ceph vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Ceph could allow unintended access to network services.

Software Description:
- ceph: distributed storage and file system

Details:

It was discovered that the Ceph Object Gateway (RGW) SigV4 handler did not
reject requests carrying x-amz-* headers that were absent from the signed
header set. An attacker holding a presigned URL could possibly use this issue to
attach arbitrary unsigned x-amz-* headers that RGW would honor, allowing them to escalate
their privileges beyond what the URL's signer intended.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
librgw2 20.2.0-0ubuntu2.1
radosgw 20.2.0-0ubuntu2.1

Ubuntu 22.04 LTS
librgw2 17.2.9-0ubuntu0.22.04.4
radosgw 17.2.9-0ubuntu0.22.04.4

Ubuntu 20.04 LTS
librgw2 15.2.17-0ubuntu0.20.04.6+esm2
Available with Ubuntu Pro
radosgw 15.2.17-0ubuntu0.20.04.6+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
librgw2 12.2.13-0ubuntu0.18.04.11+esm3
Available with Ubuntu Pro
radosgw 12.2.13-0ubuntu0.18.04.11+esm3
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8867-1
CVE-2026-54330

Package Information:
https://launchpad.net/ubuntu/+source/ceph/20.2.0-0ubuntu2.1
https://launchpad.net/ubuntu/+source/ceph/17.2.9-0ubuntu0.22.04.4

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