Answer in brief
CVE-2026-42258 records a Medium severity (CVSS 5.3) vulnerability in net-imap: Command Injection via unvalidated Symbol inputs. 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-2026-42258 records a Medium severity (CVSS 5.3) vulnerability in net-imap: Command Injection via unvalidated Symbol inputs. 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 5.3. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| ruby/net-imapgeneric | < 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
Jul 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
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, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.3. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| ruby/net-imapgeneric | < 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
Jul 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
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, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Quoted source text, attributed separately from HOL analysis.