What is CVE-2026-34826?

CVE-2026-34826 is a medium-severity vulnerability in Rack, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-04-02.

How severe is CVE-2026-34826?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Rack

CVE-2026-34826

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-202…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.000 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Rack — versions < 2.2.23, >= 3.0.0.beta1, < 3.1.21, >= 3.2.0, < 3.2.6

Weakness classification (CWE)

References

https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34826?: CVE-2026-34826 is a medium-severity vulnerability in Rack, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-04-02.
How severe is CVE-2026-34826?: Medium severity. CVSS v3 base score is 5.3 out of 10.