{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "8.4.0"
                  },
                  {
                    "fixed": "8.4.21"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "8.5.0"
                  },
                  {
                    "fixed": "8.5.6"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          "events": [
            {
              "introduced": "b437f2b32eb364c9496d24abcc734272e5c9c980"
            },
            {
              "fixed": "7a64ae0507799547fbbd39b067bd3dd2c35e8fec"
            },
            {
              "introduced": "685e99655ae97c667950f7f7d176985958718f56"
            },
            {
              "fixed": "fcc29c8d6d6ee6f5ba2d941f0a2a6ea6aa6ee633"
            }
          ],
          "repo": "https://github.com/php/php-src",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-74r9-qxhc-fx53"
  ],
  "database_specific": {
    "cna_assigner": "php",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6104.json"
  },
  "details": "In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL byte is passed to mb_convert_encoding() or related mbstring functions, the code incorrectly assumes that when strncasecmp() returns 0 it means the strings have the same length. This can lead to out-of-bounds read of global memory, potentially causing a crash or information disclosure or crash. Affected functions include mb_convert_encoding(), mb_detect_encoding(), mb_convert_variables(), and mb_detect_order(), as well as the mbstring.detect_order and mbstring.http_output INI settings.",
  "id": "CVE-2026-6104",
  "modified": "2026-11-11T02:30:48.833588648Z",
  "published": "2026-05-10T04:35:17.328Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6104.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:22649"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-6104"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6104.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/php/php-src/security/advisories/GHSA-74r9-qxhc-fx53"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6104"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468573"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L/RE:M/U:Amber",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding"
}