Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. 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-8p34-64r3-mwg8 (x_refsource_CONFIRM)
Generated from the official CVE List on 23 Jun 2026 10:05 UTC.