{"id":"CVE-2026-55828","title":"qbee transport is a remote access transport protocol implementation","summary":"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 c…","severity":"medium","cvss":6,"cvssVector":"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","cwe":["CWE-22","CWE-59"],"vendor":"qbee-io","product":"transport","affected":["transport < 1.26.25"],"patched":["go.qbee.io/transport 1.26.25"],"published":"2026-09-15","updated":"2026-09-15","sourceUpdated":"2026-09-15T19:17:22.933","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55828","references":[{"url":"https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc","label":"security-advisories@github.com"},{"url":"https://github.com/qbee-io/transport/pull/19","label":"security-advisories@github.com"},{"url":"https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-f9m7-vc86-p6jj"}],"tags":["nvd","cve.org","ghsa","go"],"ecosystem":"go","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T17:38:19.351851Z"},"cvssSource":"cna","ingestedAt":"2026-06-22T13:35:24.352Z","epss":0.00369,"epssPercentile":0.30621,"slug":"CVE-2026-55828","body":"## Overview\n\nqbee 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55828)\n\nAffected packages:\n\n- `go.qbee.io/transport < 1.26.25`\n\nPatched in:\n\n- `go.qbee.io/transport 1.26.25`\n\nSource: https://github.com/advisories/GHSA-f9m7-vc86-p6jj","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":33,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203819,"id":"CVE-2026-55828","ts":1789486795468,"field":"cvss","old":null,"new":"6"}]}