[CVE-2026-42246] Pin net-imap 0.3.10 - #457
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Jan-Kazlouski-elastic merged 3 commits intoJul 24, 2026
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JRuby 9.4.12.0 ships vulnerable default net-imap 0.2.3 (STARTTLS stripping). Pin the lowest fixed release and remove the default gem from Docker images so scanners and runtime both use 0.3.10. Part of elastic/security#12735
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Scanner A/B (
|
| Tool | Before | After |
|---|---|---|
| Trivy | reported | clear |
| Snyk | reported (SNYK-RUBY-NETIMAP-16420230) | clear |
Jan-Kazlouski-elastic
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mattnowzari
July 23, 2026 18:38
The default gem removal missed the older stdlib copy (/opt/jruby/lib/ruby/stdlib/net/imap.rb, net-imap 0.1.1), which still contains the vulnerable #starttls and is within the CVE-2026-42246 affected range (< 0.3.10). Remove it too so no vulnerable IMAP code remains in the images; the app loads the pinned 0.3.10 gem via Bundler. Part of elastic/security#12735
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July 24, 2026 14:17
Resolve NOTICE.txt conflict by regenerating it (make notice) on top of the merged Gemfile.lock, which now includes both erb 4.0.4.1 (#456) and net-imap 0.3.10.
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Jul 24, 2026
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Jul 27, 2026
Backports the following commits to 1.0: - [CVE-2026-42246] Pin net-imap 0.3.10 (#457) Co-authored-by: Jan-Kazlouski-elastic <jan.kazlouski@elastic.co>
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Part of https://github.com/elastic/security/issues/12735
Resolves CVE-2026-42246 (high) — STARTTLS stripping / response injection in
Net::IMAP#starttls. Fixed in net-imap 0.3.10.JRuby 9.4.12.0 ships vulnerable net-imap in two places: the default gem 0.2.3 and an older stdlib copy 0.1.1 (
net/imap.rb). The crawler does not use IMAP; this change removes both from the images and pins the fixed gem so scanners and runtime use 0.3.10.Changes
Gemfile/Gemfile.lock: pinnet-imap0.3.10(lowest fixed release) so Bundler installs over the JRuby default gem.Dockerfile/Dockerfile.wolfi: remove the defaultnet-imap0.2.3 gem artifacts and the older stdlibnet/imap.rb(0.1.1) from/opt/jruby.NOTICE.txt: regenerated for the new gems (make notice); added adatelicense-file fallback.Testing
0.3.10(vendor/bundle/.../net-imap-0.3.10).*imap*files under/opt/jruby, and the app still loads 0.3.10 viabundler/setup.Scanner A/B (
CVE-2026-42246)Checklists
Pre-Review Checklist
crawler.yml.exampleandelasticsearch.yml.example)v0.1.0)make noticeif any dependencies have been addedChanges Requiring Extra Attention
Release Note
Pin net-imap to 0.3.10 to resolve CVE-2026-42246 (STARTTLS stripping in Net::IMAP).