{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.3.4"
              },
              {
                "fixed": "4.9.1"
              },
              {
                "introduced": "0.3.1"
              },
              {
                "fixed": "4.9.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0b89084ea4dc5cfe353541a41059d62b62d8dc84"
            },
            {
              "fixed": "2148829ebe47d8ac2377ef234162bf6b64c5b466"
            }
          ],
          "repo": "https://github.com/weechat/weechat",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vhv8-g2r9-cwcc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-208"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53525.json"
  },
  "details": "WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.",
  "id": "CVE-2026-53525",
  "modified": "2026-08-23T03:42:53.239665500Z",
  "published": "2026-08-21T22:19:21.278Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53525.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53525"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication"
}