High RHSA-2026:37397 2 CVEs

Red Hat Security Advisory: ruby security update

Published Jul 10, 2026 · Updated Sep 1, 2026

Ecosystem: Red Hat

Fixed packages 16

Release	Package	Fixed in
Red Hat · RHEL 7 ELS rhel_els:7	ruby	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-debuginfo	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-devel	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-doc	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-irb	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-libs	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	ruby-tcltk	0:2.0.0.648-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-bigdecimal	0:1.2.0-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-io-console	0:0.4.2-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-json	0:1.7.7-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-minitest	0:4.3.2-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-psych	0:2.0.0-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-rake	0:0.9.6-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygem-rdoc	0:4.0.0-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygems	0:2.0.14.1-39.el7_9.1
Red Hat · RHEL 7 ELS rhel_els:7	rubygems-devel	0:2.0.14.1-39.el7_9.1

Vulnerabilities 2

High 7.6

CVE-2026-42246

net-imap vulnerable to STARTTLS stripping via invalid response timing

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issu…

ruby net-imap logstash-9.3-iamguarded-compat logstash-9.3 Debian Ubuntu Alpine Wolfi RubyGems

May 9, 2026
Medium 5.8

CVE-2026-42258

net-imap: Command Injection via unvalidated Symbol inputs

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 IMA…

ruby net-imap logstash-9.3 logstash-9.3-iamguarded-compat Debian Ubuntu Alpine Wolfi RubyGems

May 9, 2026

References

article
https://access.redhat.com/security/updates/classification/#important
report
https://bugzilla.redhat.com/show_bug.cgi?id=2468498
report
https://bugzilla.redhat.com/show_bug.cgi?id=2468499
advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_37397.json
report
https://access.redhat.com/security/cve/CVE-2026-42246
advisory
https://www.cve.org/CVERecord?id=CVE-2026-42246
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-42246
article
https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618
article
https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e
article
https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c
article
https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da
article
https://github.com/ruby/net-imap/releases/tag/v0.3.10
article
https://github.com/ruby/net-imap/releases/tag/v0.4.24
article
https://github.com/ruby/net-imap/releases/tag/v0.5.14
article
https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp
report
https://access.redhat.com/security/cve/CVE-2026-42258
advisory
https://www.cve.org/CVERecord?id=CVE-2026-42258
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-42258
article
https://github.com/ruby/net-imap/releases/tag/v0.6.4
article
https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px