{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:ruby-lang:net\\:\\:imap:*:*:*:*:*:ruby:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.4.24"
              },
              {
                "introduced": "0.5.0"
              },
              {
                "fixed": "0.5.14"
              },
              {
                "introduced": "0.6.0"
              },
              {
                "fixed": "0.6.4"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "24a4e770b43230286a05aa2a9746cdbb3eb8485e"
            },
            {
              "introduced": "cc13c91c65b78ee33ebf4960d547173e761cafdc"
            },
            {
              "fixed": "4063bc1d1d3e21046544ed7a2c131e5f886bab01"
            },
            {
              "introduced": "567518cae5500f7c4776a1fd4e9bbd599e98b9bf"
            },
            {
              "fixed": "3e490673dca65d0cfeeeb3fbf1fdaa188d6f27c4"
            },
            {
              "fixed": "6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96"
            },
            {
              "fixed": "88d95231fc8afef11c1f074453f7d75b68c9dfda"
            },
            {
              "fixed": "de685f91a4a4cc75eb80da898c2bf8af08d34819"
            }
          ],
          "repo": "https://github.com/ruby/net-imap",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-q2mw-fvj9-vvcw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42245.json"
  },
  "details": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.",
  "id": "CVE-2026-42245",
  "modified": "2026-07-08T05:36:07.270633821Z",
  "published": "2026-05-09T19:37:08.905Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42245.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42245"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfda"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "net-imap: Quadratic complexity when reading response literals"
}