CVE-2026-42246

Published: Mag 09, 2026 Last Modified: Mag 09, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,6
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: passive
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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.

392

Missing Report of Error Condition

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Other
Potential Impacts:
Varies By Context Unexpected State
Applicable Platforms
All platforms may be affected
View CWE Details
393

Return of Wrong Status Code

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Other
Potential Impacts:
Unexpected State Alter Execution Logic
Applicable Platforms
All platforms may be affected
View CWE Details
636

Not Failing Securely ('Failing Open')

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control
Potential Impacts:
Bypass Protection Mechanism
Applicable Platforms
Technologies: ICS/OT, Not Technology-Specific
View CWE Details
754

Improper Check for Unusual or Exceptional Conditions

Incomplete
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability
Potential Impacts:
Dos: Crash, Exit, Or Restart Unexpected State
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: Medium
View CWE Details
841

Improper Enforcement of Behavioral Workflow

Incomplete
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Other
Potential Impacts:
Alter Execution Logic
Applicable Platforms
All platforms may be affected
View CWE Details
https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf9…
https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618
https://github.com/ruby/net-imap/commit/24a4e770b43230286a0…
https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e
https://github.com/ruby/net-imap/commit/97e2488fb5401a1783b…
https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c
https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81…
https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da
https://github.com/ruby/net-imap/releases/tag/v0.3.10
https://github.com/ruby/net-imap/releases/tag/v0.3.10
https://github.com/ruby/net-imap/releases/tag/v0.4.24
https://github.com/ruby/net-imap/releases/tag/v0.4.24
https://github.com/ruby/net-imap/releases/tag/v0.5.14
https://github.com/ruby/net-imap/releases/tag/v0.5.14
https://github.com/ruby/net-imap/security/advisories/GHSA-v…
https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp