Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection
## Summary `Rack::Sendfile` can be exploited by crafting input that includes newline characters to manipulate log entries. ## Details The `Rack::Sendfile` middleware logs unsanitized header values from the `X-Sendfile-Type` header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection. ## Impact This vulnerability can distort log files, obscure attack traces, and complicate security auditing. ## Mitigation - Update to the latest version of Rack, or - Remove usage of `Rack::Sendfile`.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-27111US | high7.5 | — | ||
Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs unsanitised header values from the X-Sendfile-Type header. An attacker can exploit this by injecting… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/rack/rackPACKAGE
- https://github.com/rack/rack/commit/803aa221e8302719715e224f4476e438f2531a53WEB
- https://github.com/rack/rack/commit/aeac570bb8080ca7b53b7f2e2f67498be7ebd30bWEB
- https://github.com/rack/rack/commit/b13bc6bfc7506aca3478dc5ac1c2ec6fc53f82a3WEB
- https://github.com/rack/rack/security/advisories/GHSA-8cgq-6mh2-7j6vWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2025-27111.ymlWEB
- https://lists.debian.org/debian-lts-announce/2025/03/msg00016.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-27111ADVISORY
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