Barman snapshot backup deletion trusts unverified backup catalog metadata (CVE-2026-93853) | HOL Guard CVE

High · CVSS 7.2CVE-2026-93853

Barman snapshot backup deletion trusts unverified backup catalog metadata

Answer in brief

CVE-2026-93853 records a High severity (CVSS 7.2) vulnerability in Barman snapshot backup deletion trusts unverified backup catalog metadata. The current sources do not mark it as known exploited. The current feed maps EnterpriseDB/Barman (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps EnterpriseDB/Barman (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
EnterpriseDB/Barmangeneric	>=3.4.0 <3.20.1	3.20.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for EnterpriseDB/Barman.
Review the reported fix. Source-reported solution: Upgrade to Barman 3.20.1 or later. Before deleting a snapshot, Barman now reads the snapshot name from the cloud provider and refuses the deletion unless it matches the backup being deleted.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Source referenceenterprisedb.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.