What is CVE-2026-34830?

CVE-2026-34830 is a medium-severity vulnerability in Rack, classified under CWE-625. CVSS score: 5.9/10. Published 2026-04-02.

How severe is CVE-2026-34830?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Rack

CVE-2026-34830

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file pat…

EPSS: 0.000 (14.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

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

Weakness classification (CWE)

CWE-625

References

https://github.com/rack/rack/security/advisories/GHSA-qv7j-4883-hwh7 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34830?: CVE-2026-34830 is a medium-severity vulnerability in Rack, classified under CWE-625. CVSS score: 5.9/10. Published 2026-04-02.
How severe is CVE-2026-34830?: Medium severity. CVSS v3 base score is 5.9 out of 10.