Basekick-Labs Arc up to 2026.06.0 Raft FSM fsm.go applyRegisterFile path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in Basekick-Labs Arc up to 2026.06.0. The impacted element is the function applyRegisterFile of the file internal/cluster/raft/fsm.go of the component Raft FSM. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-48105. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Basekick-Labs Arc up to 2026.06.0. It has been classified as critical. This affects the function applyRegisterFile of the file internal/cluster/raft/fsm.go of the component Raft FSM. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Arc is an open, SQL-native time-series database for telemetry. Prior to version 26.06.1, Arc Enterprise's Raft FSM (`internal/cluster/raft/fsm.go:applyRegisterFile`) accepts attacker-chosen file paths in manifest-registration proposals without validating them against the configured storage backend. The only check is that the path is non-empty. There is no parent-traversal (`..`) rejection, no allowlist of legitimate prefixes, no scheme restriction (`s3://` vs local), and no length bound. This is fixed in 2026.06.1. Some workarounds are available. Restrict cluster network access to known-trusted peers via strict firewall rules, audit the cluster manifest for unexpected paths (any path not matching the configured storage backend root is suspect), and/or disable cluster mode until the fix is available.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-48105 since 05/20/2026. 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 T1006 for this issue.

Upgrading to version 2026.06.1 eliminates this vulnerability.

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Productinfo

Vendor

• Basekick-Labs

Name

• Arc

Version

• 2026.06

Website

• Product: https://github.com/Basekick-Labs/arc/

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