CVE-2026-71884

{
  "etk_id": "ETK-2026-1064",
  "cve_id": "CVE-2026-71884",
  "display_id": "CVE-2026-71884",
  "ghsa_id": "GHSA-qgfp-x9w9-pwj2",
  "euvd_id": "EUVD-2026-95586",
  "status": "published",
  "anchor_state": "anchored",
  "title": "CTR counter-wrap keystream reuse in bcprov-lts8on",
  "summary": "bcprov-lts8on versions before 2.73.13 have a flaw in the native one-shot CTR packet-cipher path. An attacker who can obtain ciphertext from an overlong operation using a 13–15 byte IV may recover plaintext because encryption material is reused. The issue requires use of the affected native one-shot implementation and input exceeding the counter capacity implied by the IV.",
  "mitigation": "Upgrade bcprov-lts8on to version 2.73.13 or later. Until upgrade, avoid the native one-shot CTR path with 13–15 byte IVs and ensure requests cannot exceed the available counter range.",
  "vendor": "Legion of the Bouncy Castle Inc.",
  "product": "BC-LTS-JAVA",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.73.4, < 2.73.13"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2.73.13"
      ],
      "package_name": "bcprov-lts8on",
      "purl": null
    }
  ],
  "cwes": [
    323
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber",
  "epss_score": 0.0041,
  "epss_percentile": 0.3383,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 12.1491921,
  "t0_at": "2026-10-09T09:30:50.624000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-09T09:30:50.624000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-09T09:30:50.624000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71884"
    }
  }
}