CVE-2026-112021

{
  "etk_id": "ETK-2026-1969",
  "cve_id": "CVE-2026-112021",
  "display_id": "CVE-2026-112021",
  "ghsa_id": "GHSA-6hv3-2r7g-774j",
  "euvd_id": "EUVD-2026-103474",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Heap-based buffer overflow in snac2 JSON parsing",
  "summary": "snac2 versions before 2.93 are affected by a heap-based buffer overflow in JSON parsing. An unauthenticated remote attacker can send a malformed ActivityPub JSON request that is processed before signature verification, potentially corrupting memory and crashing the server.",
  "mitigation": "Upgrade snac2 to version 2.93 or later. Until upgraded, restrict access to the ActivityPub endpoint to trusted network sources where feasible.",
  "vendor": "grunfink",
  "product": "snac2",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 2.93"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2.93"
      ],
      "package_name": "snac2",
      "purl": null
    }
  ],
  "cwes": [
    122
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0067,
  "epss_percentile": 0.5135,
  "epss_asof": "2026-10-21",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 16.4014434,
  "t0_at": "2026-10-18T11:38:40.652000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-18T12:52:10.795122+00:00",
      "days": 0.0510433231712963,
      "is_lower_bound": false,
      "measured_at": "2026-10-18T11:38:40.652000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-18T11:38:40.652000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-18T11:38:40.652000+00:00",
      "url": "https://gist.github.com/nullenvk/2bf288e2d34cb3d4b7143e61dbf7d90b"
    },
    "trigger_signal": {
      "at": "2026-10-18T11:38:40.652000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-18T11:38:40.652000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-112021"
    }
  }
}