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BREW-mailcatcher-CVE-2025-61921 — Sinatra is vulnerable to ReDoS through ETag header value generation

Affected: Homebrew: mailcatcher

### Summary

There is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response and you are using Ruby < 3.2.

### Details

Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted if they are using Ruby below version 3.2.

### Resources

* https://github.com/sinatra/sinatra/issues/2120 (report) * https://github.com/sinatra/sinatra/pull/2121 (fix) * https://github.com/sinatra/sinatra/pull/1823 (older ReDoS vulnerability) * https://bugs.ruby-lang.org/issues/19104 (fix in Ruby >= 3.2)

Withdrawn: CLEANSTART-2026-BG72514 — Uncontrolled Recursion vulnerability in Apache Commons Lang

Withdrawn by the publisher.

Affected: CleanStart: logstash-fips

Multiple security vulnerabilities affect the logstash-fips package. Uncontrolled Recursion vulnerability in Apache Commons Lang. See references for individual vulnerability details.

CVE-2025-61921 — Sinatra has ReDoS vulnerability in ETag header value generation

Affected: sinatra

Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response. Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted. Version 4.2.0 fixes the issue.