23 Oct 2026 15:48:27 UTC
btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh
cve-program · CVE-2026-62943 · Published
CVE-2026-62943
btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh
CVSS 4.0 8.7 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-62943
Publishedbtrbk 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.
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