Answer in brief
CVE-2026-42246 records a High severity (CVSS 7.4) vulnerability in net-imap vulnerable to STARTTLS stripping via invalid response timing. The current sources do not mark it as known exploited. The current feed maps ruby/net-imap (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-42246 records a High severity (CVSS 7.4) vulnerability in net-imap vulnerable to STARTTLS stripping via invalid response timing. The current sources do not mark it as known exploited. The current feed maps ruby/net-imap (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ruby/net-imap (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| ruby/net-imapgeneric | < 0.3.10 || >= 0.4.0, < 0.4.24 || >= 0.5.0, < 0.5.14 || >= 0.6.0, < 0.6.4 | Not reported |
Published upstream
May 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ruby/net-imap (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| ruby/net-imapgeneric | < 0.3.10 || >= 0.4.0, < 0.4.24 || >= 0.5.0, < 0.5.14 || >= 0.6.0, < 0.6.4 | Not reported |
Published upstream
May 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.