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 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.
- Rack
- < 2.2.23, 3.1.21, 3.2.6
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.2% (11th percentile)
- Weakness
- CWE-625
- NVD status
- Analyzed
- Published
- 2026-04-02
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