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NVD Vulnerability Details :
CVE-2026-42246
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-09 May, 2026 | 20:16
Updated At-18 May, 2026 | 18:08

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.6HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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
Primary3.17.4HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 7.6
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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
Type: Primary
Version: 3.1
Base score: 7.4
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CPE Matches
Ruby
ruby-lang
>>net\>>\
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
Ruby
ruby-lang
>>net\>>\
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
Ruby
ruby-lang
>>net\>>\
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
Ruby
ruby-lang
>>net\>>\
cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*
Weaknesses
CWE IDTypeSource
CWE-392Primarysecurity-advisories@github.com
CWE-393Primarysecurity-advisories@github.com
CWE-636Primarysecurity-advisories@github.com
CWE-754Primarysecurity-advisories@github.com
CWE-841Primarysecurity-advisories@github.com
CWE ID: CWE-392
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-393
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-636
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-754
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-841
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618security-advisories@github.com
Patch
https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485esecurity-advisories@github.com
Patch
https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42csecurity-advisories@github.com
Patch
https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873dasecurity-advisories@github.com
Patch
https://github.com/ruby/net-imap/releases/tag/v0.3.10security-advisories@github.com
Release Notes
https://github.com/ruby/net-imap/releases/tag/v0.4.24security-advisories@github.com
Release Notes
https://github.com/ruby/net-imap/releases/tag/v0.5.14security-advisories@github.com
Release Notes
https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcpsecurity-advisories@github.com
Mitigation
Vendor Advisory
Hyperlink: https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ruby/net-imap/releases/tag/v0.3.10
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/ruby/net-imap/releases/tag/v0.4.24
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/ruby/net-imap/releases/tag/v0.5.14
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp
Source: security-advisories@github.com
Resource:
Mitigation
Vendor Advisory
Change History
0Changes found
Details not found