medium5.8
CVE-2026-47242
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | net-imap | >= 0.6.0, <= 0.6.4 | 0.6.4.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-46q3-7gv7-qmgg
- https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg
- https://github.com/ruby/net-imap/releases/tag/v0.6.4.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-47242
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-47242.yml
- https://www.cve.org/CVERecord?id=CVE-2026-47242