OS Command Injection Affecting btrbk package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-BTRBK-20028251
- published21 Sept 2026
- disclosed18 Sept 2026
Introduced: 18 Sep 2026
NewCVE-2026-62943 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest btrbk.
NVD Description
Note: Versions mentioned in the description apply only to the upstream btrbk package and not the btrbk package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
btrbk is a tool for creating snapshots and remote backups of Btrfs subvolumes. From 0.29.0 until 0.32.7, btrbk's ssh_filter_btrbk.sh constructs allow_stream_match with a start anchor but without an end-of-string anchor for the complete command. A user restricted through an authorized_keys forced command can append a trailing pipe command after a valid btrbk command prefix, bypassing the allowlist and executing arbitrary commands with the privileges of the backup-target SSH account. Deployments that do not use ssh_filter_btrbk.sh in authorized_keys are not affected. This issue is fixed in version 0.32.7.