Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. This vulnerability is fixed in 0.6.5 and 0.5.15.
Severity (CVSS)
| Base score | 5.8 |
|---|---|
| Severity | Medium |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-77 — CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
- CWE-93 — CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ruby | net-imap | >= 0.6.0, < 0.6.4.1; < 0.5.15 |
References
- https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg (x_refsource_CONFIRM)
Generated from the official CVE List on 23 Jun 2026 10:05 UTC.