{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.8.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "718b92615c7963670d26c1a2b246968b58d782e8"
            },
            {
              "fixed": "89aed31f37449da32004ba608e5d1aa483b8bb21"
            }
          ],
          "repo": "https://github.com/baresip/re",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hvxv-v2gp-v93h"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-190",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50161.json"
  },
  "details": "libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr-\u003elen can wrap when hdr-\u003elen is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.",
  "id": "CVE-2026-50161",
  "modified": "2026-08-20T03:30:19.566356884Z",
  "published": "2026-08-18T17:53:01.696Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/baresip/re/releases/tag/v4.8.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50161.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50161"
    },
    {
      "type": "FIX",
      "url": "https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8"
    },
    {
      "type": "FIX",
      "url": "https://github.com/baresip/re/pull/1584"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "libre: Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow"
}