CVE-2026-42258: CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') in ruby net-imap
CVE-2026-42258 is a medium severity vulnerability in the Ruby net-imap library where improper neutralization of special elements leads to command injection via symbol arguments passed to IMAP commands. This affects net-imap versions prior to 0. 4. 24, 0. 5. 14, and 0. 6. 4. The vulnerability allows CRLF injection and IMAP command injection, potentially impacting the integrity of IMAP client operations. The issue has been patched in versions 0.
AI Analysis
Technical Summary
The Ruby net-imap library, which provides IMAP client functionality, contained a vulnerability (CVE-2026-42258) where symbol arguments to IMAP commands were not properly sanitized, leading to CRLF and command injection risks. This improper neutralization of special elements (CWE-77) could allow an attacker to inject malicious IMAP commands via crafted symbol arguments. The vulnerability affects net-imap versions before 0.4.24, 0.5.14, and 0.6.4. The issue has been addressed by patches in these versions, mitigating the injection risk.
Potential Impact
Successful exploitation could allow an attacker to inject commands into the IMAP client operations, potentially disrupting or manipulating IMAP sessions. The CVSS 4.0 score is 5.8 (medium), indicating moderate impact with local attack vector, high attack complexity, and partial user interaction required. There are no reports of exploitation in the wild.
Mitigation Recommendations
Users should upgrade net-imap to version 0.4.24, 0.5.14, or 0.6.4 or later to apply the official patches that fix this vulnerability. Since the vendor advisory does not specify otherwise, patching to these fixed versions is the recommended remediation. No additional mitigations are indicated by the vendor.
CVE-2026-42258: CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') in ruby net-imap
Description
CVE-2026-42258 is a medium severity vulnerability in the Ruby net-imap library where improper neutralization of special elements leads to command injection via symbol arguments passed to IMAP commands. This affects net-imap versions prior to 0. 4. 24, 0. 5. 14, and 0. 6. 4. The vulnerability allows CRLF injection and IMAP command injection, potentially impacting the integrity of IMAP client operations. The issue has been patched in versions 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Ruby net-imap library, which provides IMAP client functionality, contained a vulnerability (CVE-2026-42258) where symbol arguments to IMAP commands were not properly sanitized, leading to CRLF and command injection risks. This improper neutralization of special elements (CWE-77) could allow an attacker to inject malicious IMAP commands via crafted symbol arguments. The vulnerability affects net-imap versions before 0.4.24, 0.5.14, and 0.6.4. The issue has been addressed by patches in these versions, mitigating the injection risk.
Potential Impact
Successful exploitation could allow an attacker to inject commands into the IMAP client operations, potentially disrupting or manipulating IMAP sessions. The CVSS 4.0 score is 5.8 (medium), indicating moderate impact with local attack vector, high attack complexity, and partial user interaction required. There are no reports of exploitation in the wild.
Mitigation Recommendations
Users should upgrade net-imap to version 0.4.24, 0.5.14, or 0.6.4 or later to apply the official patches that fix this vulnerability. Since the vendor advisory does not specify otherwise, patching to these fixed versions is the recommended remediation. No additional mitigations are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-26T11:53:27.704Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ff93c0cbff5d86106e459b
Added to database: 5/9/2026, 8:06:24 PM
Last enriched: 5/9/2026, 8:21:24 PM
Last updated: 5/9/2026, 10:50:49 PM
Views: 4
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