{"id":"CVE-2026-55828","state":"PUBLISHED","title":"qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)","description":"qbee transport is a remote access transport protocol implementation. Prior to 1.26.25, the extractTar routine uses strictly lexical path validation that does not account for on-disk symlinks created earlier in the extraction process. A crafted tar archive can use a symlink chain to write or overwrite files one directory level above the intended extraction path. When qbee-agent performs the extraction with root privileges, this permits a root-privileged file write outside the intended destination. This issue is fixed in version 1.26.25.","publishedAt":"2026-09-15T15:14:52.244Z","updatedAt":"2026-09-15T18:02:39.851Z","severity":{"score":6,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["qbee-io transport"],"affected":[{"vendor":"qbee-io","product":"transport","versions":[{"version":"< 1.26.25","status":"affected"}]}],"references":["https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj","https://github.com/qbee-io/transport/pull/19","https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc"],"weaknesses":["CWE-22","CWE-59"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55828.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55828","state":"PUBLISHED","datePublished":"2026-09-15T15:14:52.244Z","dateUpdated":"2026-09-15T18:02:39.851Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-17T16:29:38.864Z"},"containers":{"cna":{"title":"qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)","descriptions":[{"lang":"en","value":"qbee transport is a remote access transport protocol implementation. Prior to 1.26.25, the extractTar routine uses strictly lexical path validation that does not account for on-disk symlinks created earlier in the extraction process. A crafted tar archive can use a symlink chain to write or overwrite files one directory level above the intended extraction path. When qbee-agent performs the extraction with root privileges, this permits a root-privileged file write outside the intended destination. This issue is fixed in version 1.26.25."}],"affected":[{"vendor":"qbee-io","product":"transport","versions":[{"version":"< 1.26.25","status":"affected"}]}],"references":[{"url":"https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj","name":"https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/qbee-io/transport/pull/19","name":"https://github.com/qbee-io/transport/pull/19","tags":["x_refsource_MISC"]},{"url":"https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc","name":"https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-59","lang":"en","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T15:14:52.244Z"},"source":{"advisory":"GHSA-f9m7-vc86-p6jj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T17:38:19.351851Z","id":"CVE-2026-55828","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T18:02:39.851Z"}}]}}}