CVE-2026-42258
Description
A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol (IMAP) client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is achieved by passing specially crafted symbol arguments to IMAP commands. Successful exploitation could lead to unauthorized actions on the IMAP server or client, potentially resulting in information disclosure or other integrity impacts.
Statement
This command injection flaw is limited to the injection of IMAP commands. Arbitrary code execution is not a risk of this flaw and so the impact is limited to email systems.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | 5.3 | 7.1 |
| Attack Vector | Network | Local | Network |
| Attack Complexity | Low | High | Low |
| Privileges Required | None | Low | None |
| User Interaction | Required | None | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | Low | None | Low |
| Integrity Impact | High | High | High |
| Availability Impact | None | Low | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
NVD: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
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