CVE-2026-42245

LOW EPSS 32.8%
Published May 9, 20261mo ago · Modified Jun 17, 20262w ago
2.3 CVSS 4.0
Low
Find Similar
Published May 9, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
2.3
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
32.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-407

Affected Products 3

VendorProductVersionRange
ruby-langnet\\ <0.4.24
ruby-langnet\\≥0.5.0  –  <0.5.14
ruby-langnet\\≥0.6.0  –  <0.6.4

References 7

  • github.com https://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96
    Patch
  • github.com https://github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfda
    Patch
  • github.com https://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819
    Patch
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.4.24
    Release Notes
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.5.14
    Release Notes
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.6.4
    Release Notes
  • github.com https://github.com/ruby/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcw
    MitigationVendor Advisory

Remediation

  • github.com https://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96
    Patch
  • github.com https://github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfda
    Patch
  • github.com https://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819
    Patch