{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.3.0"
              },
              {
                "fixed": "4.9.1"
              },
              {
                "fixed": "4.9.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "b407de4c3be2db851927acd0c09e9980d254e052"
            },
            {
              "fixed": "2148829ebe47d8ac2377ef234162bf6b64c5b466"
            }
          ],
          "repo": "https://github.com/weechat/weechat",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-v2v4-45wm-5cr3"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53524.json"
  },
  "details": "WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.",
  "id": "CVE-2026-53524",
  "modified": "2026-08-23T03:42:31.441009299Z",
  "published": "2026-08-21T22:18:23.432Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53524.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53524"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "WeeChat has a Decompression Bomb in Relay WebSocket (DoS)"
}