CVE-2026-26962
Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.
- Rack
- < 3.2.6
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.2% (14th percentile)
- Weakness
- CWE-93
- NVD status
- Analyzed
- Published
- 2026-04-02
No indexed exploits for CVE-2026-26962 yet
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