{"id":"CVE-2026-42245","aliases":["GHSA-q2mw-fvj9-vvcw"],"url":"https://o3.security/vulnerability/CVE-2026-42245","summary":"net-imap: Quadratic complexity when reading response literals","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.","published":"2026-05-09T19:37:08.905Z","modified":"2026-08-07T11:51:05.726954008Z","cvss":null,"epss":{"score":0.0041,"percentile":0.33742,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"net-imap","fixedVersion":"0.6.4"},{"ecosystem":"RubyGems","name":"net-imap","fixedVersion":"0.5.14"},{"ecosystem":"RubyGems","name":"net-imap","fixedVersion":"0.4.24"}],"fix":{"url":"https://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96","label":"ruby/net-imap@6091f7d"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:05.726954008Z"}}