CVE catalog

CVE-2026-62943

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 en

[CVE catalog]

Severity
High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.50% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianbtrbksid0.32.6-2vulnerable
Debianbtrbkforky0.32.6-2vulnerable
Debianbtrbktrixie0.32.6-2vulnerable
Debianbtrbkbookworm0.32.5-1vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianbtrbksourcesid(unfixed)not yet assignedNot reported[1148559]
Debianbtrbksourceforky(unfixed)not yet assignedNot reported[1148559]
Debianbtrbksourcetrixie(unfixed)not yet assignedNot reported[1148559]
Debianbtrbksourcebookworm(unfixed)not yet assignedNot reported[1148559]

[Debian bug #1148559]

Notes

[trixie] btrbk: Minor issue [bookworm] btrbk: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [btrbk]Affected
    Details (2)

    • 0.32.5-1 · all · bookworm

      Affected

      nvd · btrbk · debian · bookworm; nvd · btrbk · debian · 12

    • 0.32.5-1 · all · bookworm

      Affected

      nvd · btrbk · debian · bookworm; nvd · btrbk · debian · 12

[Debian 13 (Trixie)]

  • [btrbk]Affected
    Details (2)

    • 0.32.6-2 · all · trixie

      Affected

      nvd · btrbk · debian · 13

    • 0.32.6-2 · all · trixie

      Affected

      nvd · btrbk · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]