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Security Advisories

CVE-2026-34826

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-34826

Severity

5.3

Medium

CVSS V3

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Summary

Rack: Unbounded Range Count in get_byte_ranges Enables DoS

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-34826
  • https://github.com/advisories/GHSA-x8cg-fq8g-mxfx
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34826.json
  • https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx

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