{"id":"CVE-2026-62943","state":"PUBLISHED","title":"btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh","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.","publishedAt":"2026-09-18T16:24:48.513Z","updatedAt":"2026-09-21T20:50:09.611Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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":"GitHub_M"},"assigner":"GitHub_M","products":["digint btrbk"],"affected":[{"vendor":"digint","product":"btrbk","versions":[{"version":">= 0.29.0, < 0.32.7","status":"affected"}]}],"references":["https://github.com/digint/btrbk/security/advisories/GHSA-pf45-7g54-65h5","https://github.com/digint/btrbk/commit/29ca3c093205395bdeb9dd98677ab4139c458aec","https://github.com/digint/btrbk/releases/tag/v0.32.7"],"weaknesses":["CWE-78"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62943.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62943","state":"PUBLISHED","datePublished":"2026-09-18T16:24:48.513Z","dateUpdated":"2026-09-21T20:50:09.611Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-14T22:32:17.731Z"},"containers":{"cna":{"title":"btrbk: SSH Command Filter Bypass in ssh_filter_btrbk.sh","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"digint","product":"btrbk","versions":[{"version":">= 0.29.0, < 0.32.7","status":"affected"}]}],"references":[{"url":"https://github.com/digint/btrbk/security/advisories/GHSA-pf45-7g54-65h5","name":"https://github.com/digint/btrbk/security/advisories/GHSA-pf45-7g54-65h5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/digint/btrbk/commit/29ca3c093205395bdeb9dd98677ab4139c458aec","name":"https://github.com/digint/btrbk/commit/29ca3c093205395bdeb9dd98677ab4139c458aec","tags":["x_refsource_MISC"]},{"url":"https://github.com/digint/btrbk/releases/tag/v0.32.7","name":"https://github.com/digint/btrbk/releases/tag/v0.32.7","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-18T16:24:48.513Z"},"source":{"advisory":"GHSA-pf45-7g54-65h5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T19:24:36.668834Z","id":"CVE-2026-62943","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-21T20:50:09.611Z"}}]}}}