digint btrbk up to 0.32.6 SSH Filter ssh_filter_btrbk.sh allow_stream_match os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in digint btrbk up to 0.32.6. This impacts the function allow_stream_match of the file ssh_filter_btrbk.sh of the component SSH Filter. Performing a manipulation results in os command injection. This vulnerability is known as CVE-2026-62943. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in digint btrbk up to 0.32.6. It has been classified as critical. This affects the function allow_stream_match of the file ssh_filter_btrbk.sh of the component SSH Filter. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-62943 since 07/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 0.32.7 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• digint

Name

• btrbk

Version

• 0.32.0
• 0.32.1
• 0.32.2
• 0.32.3
• 0.32.4
• 0.32.5
• 0.32.6

Website

• Product: https://github.com/digint/btrbk/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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