EUVD-2026-18386
GHSA-x8cg-fq8g-mxfx
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
4Tags
Description
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.
Analysis
Denial of service in Rack versions prior to 2.2.23, 3.1.21, and 3.2.6 allows unauthenticated remote attackers to consume disproportionate CPU, memory, I/O, and bandwidth by supplying many small overlapping byte ranges in HTTP Range headers, bypassing the existing CVE-2024-26141 fix that only validates total byte coverage. The vulnerability affects Rack's file-serving paths that process multipart byte range responses, enabling attackers to degrade service availability with minimal request complexity.
Sign in for full analysis, threat intelligence, and remediation guidance.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today