Vulnerability · Published Sep 29, 2026 · Assigned by EDB
CVE-2026-93853Barman snapshot backup deletion trusts unverified backup catalog metadata
High 7.2
In plain English
A high-severity security flaw in Barman from EnterpriseDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Unverified ownership in Barman snapshot backup deletion allows a principal who can write the backup catalog to cause Barman to delete unrelated cloud snapshots. When a snapshot backup is deleted, either explicitly or by retention policy enforcement, Barman reads the snapshot identifiers from the backup.info file and passes them to the cloud provider's delete API using Barman's own credentials, without verifying that the snapshots belong to that backup. An attacker who can overwrite backup.info but lacks snapshot delete permissions can substitute the identifiers of other snapshots, causing Barman to delete any snapshot its cloud identity can reach on AWS, Microsoft Azure, or Google Cloud. Exploitation requires a deployment where the principal that writes the backup catalog is separate from the identity Barman uses to delete snapshots. Barman versions from 3.4.0 (Google Cloud), 3.6.0 (Azure), and 3.7.0 (AWS) up to and including 3.20.0 are affected. The issue is fixed in Barman 3.20.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | barman | no fix listed | DEBIAN-CVE-2026-93853 |
| Debian:13 | barman | no fix listed | DEBIAN-CVE-2026-93853 |
| Debian:14 | barman | 3.20.1-1 | DEBIAN-CVE-2026-93853 |
| Ubuntu:22.04:LTS | barman | no fix listed | UBUNTU-CVE-2026-93853 |
| Ubuntu:24.04:LTS | barman | no fix listed | UBUNTU-CVE-2026-93853 |
| Ubuntu:26.04:LTS | barman | no fix listed | UBUNTU-CVE-2026-93853 |
| Ubuntu:26.10 | barman | no fix listed | UBUNTU-CVE-2026-93853 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| EnterpriseDB | Barman | 3.4.0 – before 3.20.1 |
Weakness: CWE-283 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H