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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42245

33
FAUCET Score

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.

First published: May 9, 2026Last modified: May 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.24CPE matchmatch criteria
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
>= 0.5.0, < 0.5.14CPE matchmatch criteria
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
>= 0.6.0, < 0.6.4CPE matchmatch criteria
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 4.0

2.3LOW

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
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
33.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0041 is in the 13th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: net-imapFixed in: 0.6.4
rubygemspatch availablevia ghsa
Product: net-imapFixed in: 0.5.14
rubygemspatch availablevia ghsa
Product: net-imapFixed in: 0.4.24

Vendor Advisories (1)

rubygemsGHSA-q2mw-fvj9-vvcwlow

net-imap has quadratic complexity when reading response literals

May 4, 2026

References

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