The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions.
The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade rubygem-minitestUpgrade ruby-irbUpgrade ruby-develUpgrade rubygem-rdocUpgrade rubygem-rakeUpgrade rubygems-develUpgrade ruby-debuginfoUpgrade rubygem-psychUpgrade ruby-libsUpgrade rubygem-bigdecimalUpgrade rubygem-io-consoleUpgrade ruby-tcltkUpgrade rubygem-jsonUpgrade ruby-docUpgrade rubyUpgrade rubygems | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade ruby3.2-bundled-gems-debuginfoUpgrade ruby3.2-rubygem-rbsUpgrade ruby3.2-libs-debuginfoUpgrade ruby3.2-rubygem-jsonUpgrade ruby3.2-develUpgrade ruby3.2-rubygem-test-unitUpgrade ruby3.2-rubygem-psychUpgrade ruby3.2-rubygems-develUpgrade ruby3.2-rubygem-io-consoleUpgrade ruby3.2-rubygem-bundlerUpgrade ruby3.2-rubygem-irbUpgrade ruby3.2-rubygem-rexmlUpgrade ruby3.2-rubygem-rakeUpgrade ruby3.2-rubygem-json-debuginfoUpgrade ruby3.2-default-gemsUpgrade ruby3.2-rubygem-typeprofUpgrade ruby3.2-libsUpgrade ruby3.2-debugsourceUpgrade ruby3.2-rubygem-bigdecimalUpgrade ruby3.2-rubygem-bigdecimal-debuginfoUpgrade ruby3.2-debuginfoUpgrade ruby3.2-rubygem-rssUpgrade ruby3.2-rubygem-rdocUpgrade ruby3.2Upgrade ruby3.2-rubygemsUpgrade ruby3.2-rubygem-psych-debuginfoUpgrade ruby3.2-bundled-gemsUpgrade ruby3.2-rubygem-rbs-debuginfoUpgrade ruby3.2-rubygem-minitestUpgrade ruby3.2-rubygem-io-console-debuginfoUpgrade ruby3.2-docUpgrade ruby3.2-rubygem-power_assert | Jul 30, 2025 | Jun 25, 2025 |
| Apple Osx Ruby | — | Upgrade macOS to the latest version | Nov 4, 2025 | Nov 3, 2025 |
| Debian | — | Upgrade ruby-webrick | Jun 27, 2025 | Jun 25, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade ruby-helpUpgrade ruby-irbUpgrade rubygem-io-consoleUpgrade rubygem-bigdecimalUpgrade rubygem-did_you_meanUpgrade rubygem-jsonUpgrade rubygemsUpgrade rubygem-rdocUpgrade rubyUpgrade rubygem-opensslUpgrade rubygem-psych | Nov 12, 2025 | Nov 6, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 25, 2025 |
| Suse | — | Upgrade ruby2.5-docUpgrade ruby2.5Upgrade ruby2.5-devel-extraUpgrade ruby2.5-stdlibUpgrade ruby2.5-doc-riUpgrade libruby2_5-2_5Upgrade ruby2.5-devel | Aug 14, 2025 | Aug 8, 2025 |
| Ubuntu | — | Upgrade libruby2.7 (Ubuntu Pro)Upgrade ruby2.3 (Ubuntu Pro)Upgrade libruby2.3 (Ubuntu Pro)Upgrade ruby2.5 (Ubuntu Pro)Upgrade ruby-webrickUpgrade libruby2.5 (Ubuntu Pro) | Aug 4, 2025 | Jun 25, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 11, 2025 | Jun 25, 2025 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub