CVE-2026-34830 (GCVE-0-2026-34830)
Vulnerability from cvelistv5
Published
2026-04-02 16:47
Modified
2026-04-02 18:59
CWE
  • CWE-625 - Permissive Regular Expression
Summary
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 paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Impacted products
Vendor Product Version
rack rack Version: < 2.2.23
Version: >= 3.0.0.beta1, < 3.1.21
Version: >= 3.2.0, < 3.2.6
Create a notification for this product.
Show details on NVD website


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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