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Barman snapshot backup deletion trusts unverified backup catalog metadata

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-93853

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93853

Barman

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "EnterpriseDB",
    "product": "Barman",
    "versions": [
      {
        "status": "affected",
        "version": "3.4.0",
        "lessThan": "3.20.1",
        "versionType": "custom"
      }
    ],
    "collectionURL": "https://github.com/EnterpriseDB/barman",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-93853

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#4548 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement