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CVE-2026-48050 – Unauthenticated Info Disclosure & DoS via Exposed pprof Endpoints – Arc (Basekick-L

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Summary

CVE-2026-48050 is a missing-authentication vulnerability in Arc, the open-source SQL-native time-series database for telemetry maintained by Basekick-Labs. Arc registers Go’s net/http/pprof debug handlers and mistakenly includes the /debug/pprof/* path prefix in its list of publicly accessible routes, causing the authentication middleware to bypass token checks for these endpoints. As a result, an unauthenticated network attacker can retrieve sensitive runtime data and trigger CPU-exhaustion denial-of-service conditions, earning this issue a High severity rating.

Technical details

  • Root cause: Arc’s HTTP server mounts Go’s standard net/http/pprof package at /debug/pprof/* (via pprof.New() in internal/api/server.go), and this path prefix is included in the application’s PublicPrefixes list (defined in cmd/arc/main.go).
  • Trigger condition: The authentication middleware performs a prefix match against PublicPrefixes and short-circuits the token/authorization check whenever a request path matches, so any request beginning with /debug/pprof skips authentication entirely.
  • Attack vector: Remote and unauthenticated — an attacker who can reach the Arc HTTP/API port over the network can send simple GET requests (no credentials required) to endpoints such as /debug/pprof/heap, /debug/pprof/goroutine?debug=2, /debug/pprof/profile?seconds=N, or /debug/pprof/trace.
  • Impact:
    • Information disclosure: heap dumps and goroutine stacks can expose sensitive in-memory data, including cached authentication tokens, SQL query strings, and internal application state/code paths.
    • Denial of service: requesting extended CPU profiles or execution traces can consume server CPU and memory resources, degrading or disrupting service availability.

Affected software

  • Product: Arc (github.com/basekick-labs/arc)
  • Vulnerable versions: All releases prior to 26.06.1 (module versions before 0.0.0-20260520170331-32a4091fb949)
  • Fixed version: 26.06.1 and later

Severity

  • CVSS Score: 8.8 (High)
  • Vector (CVSS v4.0): CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
  • Reflects network attack vector, low attack complexity, no privileges or user interaction required, low confidentiality impact, and high availability impact.

Mitigation and recommended actions

  • Immediate: Upgrade Arc to version 26.06.1 or later, which removes the /debug/pprof prefix from the public route list and corrects the authentication bypass.
  • If patching is not immediately possible:
    • Block access to /debug/pprof* paths at the reverse proxy or load balancer in front of Arc.
    • Restrict network access to the Arc API port using firewall rules, limiting exposure to trusted internal hosts only.
    • Where feasible, disable the pprof handler registration in the deployed build until the upgrade can be applied.

References

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