{"id":"GHSA-j93g-rp6m-j32m","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.","aliases":["CVE-2026-48050","GO-2026-5457"],"modified":"2026-06-25T23:11:46.654800979Z","published":"2026-06-11T17:10:21Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-200","CWE-306","CWE-400"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-11T17:10:21Z"},"references":[{"type":"WEB","url":"https://github.com/Basekick-Labs/arc/security/advisories/GHSA-j93g-rp6m-j32m"},{"type":"WEB","url":"https://github.com/Basekick-Labs/arc/commit/32a4091fb949f9cf060cdd804a07f6450dc426a8"},{"type":"PACKAGE","url":"https://github.com/Basekick-Labs/arc"},{"type":"WEB","url":"https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1"}],"affected":[{"package":{"name":"github.com/basekick-labs/arc","ecosystem":"Go","purl":"pkg:golang/github.com/basekick-labs/arc"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260520170331-32a4091fb949"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-j93g-rp6m-j32m/GHSA-j93g-rp6m-j32m.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}