Description
It was discovered that dpkg-deb (a component of dpkg, the Debian package management system) does not properly validate the end of the data stream when uncompressing a zstd-compressed .deb archive, which may result in denial of service (infinite loop spinning the CPU).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Debian | dpkg | 1.21.18 – < 1.23.6 | 1.23.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dpkg | 1.23.6 | — |
| Debian 13 | dpkg | 1.22.22 | — |
| Debian 12 | dpkg | 1.21.23 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | dpkg | 1.22.21ubuntu3.2 | USN-8249-1 |
| Ubuntu 24.04 LTS | dpkg | 1.22.6ubuntu6.6 | USN-8249-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | dpkg +1 | 1.22.21-160000.3.1 | SUSE-SU-2026:22085-1 |
| SLES 16.0 | dpkg +1 | 1.22.21-160000.3.1 | SUSE-SU-2026:22085-1 |
| SLE Micro 6.2 | update-alternatives | 1.22.21-160000.3.1 | SUSE-SU-2026:22046-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | update-alternatives | 1.22.0-slfo.1.1_3.1 | SUSE-SU-2026:20766-1 |
| SLE Micro 6.0 | update-alternatives | 1.22.0-3.1 | SUSE-SU-2026:20795-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dpkg | 1.22.22-1.1 | openSUSE-SU-2026:10675-1 |
| openSUSE Leap 16.0 | dpkg +1 | 1.22.21-160000.3.1 | openSUSE-SU-2026:20909-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | dpkg | No fix yet | — |
Advisories 8
- SUSE-SU-2026:22085-1 Security update for dpkg SUSE / openSUSE Security Updates · Jun 16, 2026
- WID-SEC-2026-0633 dpkg: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 14, 2026
- SUSE-SU-2026:22046-1 Security update for dpkg SUSE / openSUSE Security Updates · Jun 10, 2026
- openSUSE-SU-2026:20909-1 Security update for dpkg SUSE / openSUSE Security Updates · Jun 9, 2026
- USN-8249-1 dpkg vulnerability Ubuntu Security Notices (USN) · May 8, 2026
- openSUSE-SU-2026:10675-1 dpkg-1.22.22-1.1 on GA media SUSE / openSUSE Security Updates · May 5, 2026
- SUSE-SU-2026:20766-1 Security update for dpkg SUSE / openSUSE Security Updates · Mar 25, 2026
- SUSE-SU-2026:20795-1 Security update for dpkg SUSE / openSUSE Security Updates · Mar 25, 2026