{"id":"CVE-2026-48050","aliases":["GHSA-j93g-rp6m-j32m","GO-2026-5457"],"url":"https://o3.security/vulnerability/CVE-2026-48050","summary":"Arc: Unauthenticated access to Go debug pprof endpoints leaks runtime state and enables CPU-burn DoS","details":"### Summary\n\nArc registers Go's `net/http/pprof` handlers at `/debug/pprof/*` via `app.Use(pprof.New())` in `internal/api/server.go`, and `/debug/pprof` is added to `PublicPrefixes` in `cmd/arc/main.go`. The auth middleware short-circuits before the token check on prefix match, so the endpoints are reachable without any authentication.\n\n### Impact\n\nAny network-reachable caller (no token required) can:\n\n- Fetch `/debug/pprof/heap` — leaks in-memory state: live SQL strings, decoded msgpack records, decompressed request bodies, cached `*TokenInfo` (the auth cache keys on SHA-256 of the plaintext token at `auth.go:543`).\n- Fetch `/debug/pprof/goroutine?debug=2` — leaks call stacks, identifying internal code paths.\n- Fetch `/debug/pprof/profile?seconds=N` — pins a CPU core for arbitrary duration. Trivial DoS amplification (one short HTTP request → minutes of server CPU).\n- Fetch `/debug/pprof/trace` — long-duration execution trace, similar DoS profile.\n\nNo authentication, no rate limiting, no resource bound on the `seconds` parameter.\n\n### Patches\n\nhttps://github.com/Basekick-Labs/arc/releases/tag/v26.06.1\n\nPlanned mitigation:\n\n1. Gate pprof registration behind an env var (`ARC_DEBUG_PPROF=1`) that defaults to off.\n2. When enabled, bind pprof to a separate localhost-only listener (`127.0.0.1:6060` via dedicated `net/http` server) so it's never reachable from the public API port.\n3. Remove `/debug/pprof` from `PublicPrefixes`.\n4. Fix the `HasPrefix` bug where `\"/debug/pprofX\"` matches `\"/debug/pprof\"`.\n\n### Workarounds\n\n- Block `/debug/pprof*` at a reverse proxy / load balancer in front of Arc.\n- Restrict Arc's API port to known-trusted networks via firewall rules.\n- Patch the running build: comment out `app.Use(pprof.New())` in `internal/api/server.go` and rebuild.\n\n### Credits\n\nReported by Alex Manson ([@NeuroWinter](https://github.com/NeuroWinter), https://neurowinter.com/) on 2026-05-19.","published":"2026-08-21T22:40:12.771Z","modified":"2026-10-21T02:58:17.458052392Z","cvss":null,"epss":{"score":0.00358,"percentile":0.29475,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/basekick-labs/arc","fixedVersion":"0.0.0-20260520170331-32a4091fb949"}],"fix":{"url":"https://github.com/Basekick-Labs/arc/commit/32a4091fb949f9cf060cdd804a07f6450dc426a8","label":"Basekick-Labs/arc@32a4091"},"references":[{"type":"WEB","url":"https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1"},{"type":"ADVISORY","url":"https://github.com/Basekick-Labs/arc/security/advisories/GHSA-j93g-rp6m-j32m"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48050.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48050"},{"type":"FIX","url":"https://github.com/Basekick-Labs/arc/commit/32a4091fb949f9cf060cdd804a07f6450dc426a8"},{"type":"PACKAGE","url":"https://github.com/Basekick-Labs/arc"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:58:17.458052392Z"}}