DEBIAN-CVE-2026-39944

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Source
https://security-tracker.debian.org/tracker/CVE-2026-39944
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39944.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-39944
Upstream
Published
2026-08-28T00:17:27Z
Modified
2026-09-09T08:47:26Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the RADOS Gateway (RGW) protects STS session tokens with an AES-128-CBC handler that provides no message authentication, allowing an attacker who holds any valid STS token to tamper with it undetected and escalate to full RGW administrative access. Because the ciphertext is unauthenticated, the attacker can perform a CBC bit-flip on the acct_type, perm_type, and is_admin fields of their own token, and a forged is_admin value triggers a global administrative override that bypasses all capability checks. The attack is reachable remotely over the RGW S3 endpoint and is a self-contained modification of a token the attacker already possesses, requiring no encryption oracle and no network observation. It requires only a single valid STS token, which need not carry any elevated privileges, with STS enabled. This issue is fixed in versions 20.2.4 and 19.2.6.

References

Affected packages

Debian:12 / ceph

Package

Name
ceph
Purl
pkg:deb/debian/ceph?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

16.*
16.2.11+ds-2
16.2.11+ds-3
16.2.11+ds-4
16.2.11+ds-5
16.2.11+ds-5.1
16.2.15+ds-0+deb12u1
16.2.15+ds-0+deb12u2
18.*
18.2.0+ds-1
18.2.0+ds-2
18.2.0+ds-3
18.2.0+ds-4
18.2.0+ds-5
18.2.0+ds-6
18.2.0+ds-7
18.2.0+ds-8
18.2.1+ds-1
18.2.1+ds-2
18.2.1+ds-3
18.2.1+ds-4
18.2.1+ds-5
18.2.1+ds-6
18.2.1+ds-7
18.2.1+ds-8
18.2.1+ds-9
18.2.3+ds-1
18.2.3+ds-2
18.2.3+ds-3
18.2.3+ds-3+loong64
18.2.4+ds-1
18.2.4+ds-2
18.2.4+ds-3
18.2.4+ds-4
18.2.4+ds-5
18.2.4+ds-6
18.2.4+ds-7
18.2.4+ds-8
18.2.4+ds-9
18.2.4+ds-10
18.2.4+ds-11
18.2.4+ds-12
18.2.4+ds-13
18.2.6-1
18.2.7-1
18.2.7-2
18.2.7+ds-1
18.2.7+ds-1.1
18.2.8+ds-1
18.2.8+ds-2
18.2.8+ds-2.1
20.*
20.2.2+ds-1
20.2.2+ds-2
20.2.2+ds-3
20.2.2+ds-4
20.2.2+ds-5
20.2.2+ds-6
20.2.2+ds-7
20.2.2+ds-8
20.2.2+ds-9
20.2.2+ds-10
20.2.2+ds-11
20.2.2+ds-12
20.2.2+ds-13
20.2.4+ds-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39944.json"

Debian:13 / ceph

Package

Name
ceph
Purl
pkg:deb/debian/ceph?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

18.*
18.2.7+ds-1
18.2.7+ds-1+deb13u1
18.2.7+ds-1.1
18.2.8+ds-1
18.2.8+ds-2
18.2.8+ds-2.1
20.*
20.2.2+ds-1
20.2.2+ds-2
20.2.2+ds-3
20.2.2+ds-4
20.2.2+ds-5
20.2.2+ds-6
20.2.2+ds-7
20.2.2+ds-8
20.2.2+ds-9
20.2.2+ds-10
20.2.2+ds-11
20.2.2+ds-12
20.2.2+ds-13
20.2.4+ds-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39944.json"

Debian:14 / ceph

Package

Name
ceph
Purl
pkg:deb/debian/ceph?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
20.2.4+ds-1

Affected versions

18.*
18.2.7+ds-1
18.2.7+ds-1.1
18.2.8+ds-1
18.2.8+ds-2
18.2.8+ds-2.1
20.*
20.2.2+ds-1
20.2.2+ds-2
20.2.2+ds-3
20.2.2+ds-4
20.2.2+ds-5
20.2.2+ds-6
20.2.2+ds-7
20.2.2+ds-8
20.2.2+ds-9
20.2.2+ds-10
20.2.2+ds-11
20.2.2+ds-12
20.2.2+ds-13

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39944.json"