CVE-2026-48050: Arc Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j93g-rp6m-j32m",
  "modified" : "2026-06-11T17:10:21Z",
  "published" : "2026-06-11T17:10:21Z",
  "aliases" : [ "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.",
  "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/basekick-labs/arc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-20260520170331-32a4091fb949"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-306", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-11T17:10:21Z",
    "nvd_published_at" : null
  }
}