Fluid Attacks Database

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
rubygems	net-imap	>=0.6.0 <0.6.4 \|\| >=0.5.0 <0.5.14 \|\| >=0 <0.4.24	0.6.4, 0.5.14, 0.4.24
debian 11	ruby2.7	=2.7.4-1 \|\| =2.7.4-1+deb11u1 \|\| =2.7.4-1+deb11u2 \|\| =2.7.4-1+deb11u3 \|\| =2.7.4-1+deb11u4 \|\| =2.7.4-1+deb11u5 \|\| =2.7.5-1	-
debian 12	ruby3.1	=3.1.2-7 \|\| =3.1.2-7+deb12u1 \|\| =3.1.2-7+hurd.1 \|\| =3.1.2-8 \|\| =3.1.2-8.1~exp1 \|\| =3.1.2-8.3 \|\| =3.1.2-8.4 \|\| =3.1.2-8.5	-
debian 13	ruby3.3	=3.3.8-2 \|\| =3.3.8-2.1 \|\| =3.3.8-2.2	-
debian 14	ruby3.3	=3.3.8-2 \|\| =3.3.8-2.1 \|\| =3.3.8-2.2	-

Aliases

1. CVE-2026-422582. NVD-2026-422583. OSV-2026-422584. OSV-DEBIAN-2026-422585. GHSA-75xq-5h9v-w6px6. GCVE-2026-422587. SECURITY-TRACKER-CVE-2026-42258

References

1. https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px2. https://github.com/ruby/net-imap/commit/6bf02aef7e0b5931010c36e377f79a71636b306b3. https://github.com/ruby/net-imap/commit/9db3e9d60bfb8f3735ea95015bf8a700f4af9cbb4. https://github.com/ruby/net-imap/commit/aec06996eb87a7e1bbcef1f9f8926e8add2b8c715. https://github.com/ruby/net-imap/releases/tag/v0.4.246. https://github.com/ruby/net-imap/releases/tag/v0.5.147. https://github.com/ruby/net-imap/releases/tag/v0.6.48. https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42258.yml

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