ruby-rack: Rack is a modular Ruby web server interface
CVE-2026-34826 is fixed in 2 products on 1 platform, first by ruby-rack 3.2.4-1ubuntu1.1, released April 2, 2026. It is not reported as exploited. Patch Radar priority: High.
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rmt-server · opensuse-leap 16.0 | 3.1.0-160000.1.1 | OPENSUSE-SU-2026:21640-1 | Aug 25, 2026 |
| rmt-server · sles 15.6 | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 | Jun 22, 2026 |
| rmt-server · sles 16.0 | 3.1.0-160000.1.1 | SUSE-SU-2026:23321-1 | Aug 25, 2026 |
| ruby-rack · Debian 12.15 (bookworm) | 2.2.22-0+deb12u2 | DEBIAN-CVE-2026-34826 | Apr 2, 2026 |
| ruby-rack · Debian 13.5 (trixie) | 3.1.20-0+deb13u2 | DEBIAN-CVE-2026-34826 | Apr 2, 2026 |
| ruby-rack · Debian 14 | 3.2.6-2 | DEBIAN-CVE-2026-34826 | Apr 2, 2026 |
| ruby-rack · Ubuntu 18.04.6 LTS (bionic) | 1.6.4-4ubuntu0.2+esm10 | ruby-rack 1.6.4-4ubuntu0.2+esm10 | Apr 30, 2026 |
| ruby-rack · Ubuntu 22.04.1 LTS (jammy) | 2.1.4-5ubuntu1.2+esm3 | ruby-rack 2.1.4-5ubuntu1.2+esm3 | Apr 30, 2026 |
| ruby-rack · Ubuntu 24.04.5 LTS (noble) | 2.2.7-1ubuntu0.7 | ruby-rack 2.2.7-1ubuntu0.7 | Apr 30, 2026 |
| ruby-rack · Ubuntu 25.10 (questing) | 3.1.16-0.1ubuntu0.3 | ruby-rack 3.1.16-0.1ubuntu0.3 | Apr 30, 2026 |
| ruby-rack · Ubuntu 26.04.1 LTS (resolute) | 3.2.4-1ubuntu1.1 | ruby-rack 3.2.4-1ubuntu1.1 | Apr 2, 2026 |
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