net-imap: Quadratic complexity when reading response literals_CVE-2026-42245

2.3 / 10

LOW

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

Description

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.

Basic Information

ID CVE-2026-42245

Source GitHub_M

Published May 9, 2026 at 19:37

Affected Product

Vendor ruby

Product net-imap

Version < 0.4.24

Affected Versions ruby net-imap < 0.4.24
ruby net-imap >= 0.5.0, < 0.5.14
ruby net-imap >= 0.6.0, < 0.6.4

CWE Classification

CWE-407

References

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    "published": "2026-05-09T19:37:08.905Z",
    "modified": "2026-05-09T19:37:08.905Z",
    "type": "cve",
    "title": "net-imap: Quadratic complexity when reading response literals",
    "source": "GitHub_M",
    "references": "https://github.com/ruby/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcw\nhttps://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96\nhttps://github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfda\nhttps://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819\nhttps://github.com/ruby/net-imap/releases/tag/v0.4.24\nhttps://github.com/ruby/net-imap/releases/tag/v0.5.14\nhttps://github.com/ruby/net-imap/releases/tag/v0.6.4",
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