Out-of-bounds read in urldecode() on NetBSD

{
  "id": "e9e4d04c11c80f0f5c15f9e06cc6783e8a7c2dace29119e287239e86a821a268",
  "url": "https://osv.dev/vulnerability/CVE-2026-7258",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out-of-bounds read in urldecode() on NetBSD",
    "summary": "In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.",
    "evidence": "osv:CVE-2026-7258",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-7258",
      "aliases": [
        "BIT-libphp-2026-7258",
        "BIT-php-2026-7258",
        "BIT-php-min-2026-7258",
        "CVE-2026-7258",
        "GHSA-m8rr-4c36-8gq4"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Amber"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/php/php-src",
              "type": "GIT",
              "events": [
                {
                  "introduced": "70ee6c20ad97e02c2b8098aeea96fefbbc3ac5c2"
                },
                {
                  "fixed": "482ca6c19c4d776c37bcdd5823edd524f4199cfa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.2.0"
                      },
                      {
                        "fixed": "8.2.21"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7258.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.126730645Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7258.json",
        "https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-7258"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "php",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.2.*"
                  },
                  {
                    "fixed": "8.2.31"
                  },
                  {
                    "introduced": "8.3.*"
                  },
                  {
                    "fixed": "8.3.31"
                  },
                  {
                    "introduced": "8.4.*"
                  },
                  {
                    "fixed": "8.4.21"
                  },
                  {
                    "introduced": "8.5.*"
                  },
                  {
                    "fixed": "8.5.6"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "8.2.31"
                  },
                  {
                    "fixed": "8.3.31"
                  },
                  {
                    "fixed": "8.4.21"
                  },
                  {
                    "fixed": "8.5.6"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7258.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-7258",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497179,
  "published_at": "2026-05-10T04:28:14.52+00:00"
}