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CVE-2026-62943— btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh

Quick assessment

Affected
digint btrbk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 restrict

CVSS 8.7 · High
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I. Basic Information for CVE-2026-62943

Vulnerability Information

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Vulnerability Title
btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
digint btrbk >= 0.29.0, < 0.32.7 -

II. Public POCs for CVE-2026-62943

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III. Intelligence Information for CVE-2026-62943

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Patches & Fixes for CVE-2026-62943 (1)

Other References for CVE-2026-62943 (2)

IV. Related Vulnerabilities

Same weakness: CWE-78

V. Comments for CVE-2026-62943

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