net-imap: Quadratic complexity when reading response literals

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Summary

CVECVE-2026-42245
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-09 20:16:28 UTC
Updated2026-05-09 20:16:28 UTC
DescriptionNet::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.

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from [email protected]

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

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.3LOWCVSS: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/C...
4.0CNADECLARED2.3LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Passive
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ruby Net-imap affected < 0.4.24 Not specified
CNA Ruby Net-imap affected >= 0.5.0, < 0.5.14 Not specified
CNA Ruby Net-imap affected >= 0.6.0, < 0.6.4 Not specified

References

ReferenceSourceLinkTags
github.com/ruby/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcw [email protected] github.com
github.com/ruby/net-imap/releases/tag/v0.6.4 [email protected] github.com
github.com/ruby/net-imap/releases/tag/v0.5.14 [email protected] github.com
github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96 [email protected] github.com
github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfda [email protected] github.com
github.com/ruby/net-imap/releases/tag/v0.4.24 [email protected] github.com
github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819 [email protected] github.com
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