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BREW-mailcatcher-CVE-2025-61772 — Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)

2026-10-02T08:50:50.043043+00:00

Affected: Homebrew: mailcatcher

## Summary

`Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS).

## Details

While reading multipart headers, the parser waits for `CRLFCRLF` using:

```ruby @sbuf.scan_until(/(.*?\r\n)\r\n/m) ```

If the terminator never appears, it continues appending data (`@sbuf.concat(content)`) indefinitely. There is no limit on accumulated header bytes, so a single malformed part can consume memory proportional to the request body size.

## Impact

Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected.

## Mitigation

* Upgrade to a patched Rack version that caps per-part header size (e.g., 64 KiB). * Until then, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`).

Withdrawn: CLEANSTART-2026-BG72514 — Uncontrolled Recursion vulnerability in Apache Commons Lang

2026-10-02T08:50:50.043166+00:00

Withdrawn by the publisher.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-2025-61772 — Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)

2026-10-02T08:50:50.043211+00:00

Affected: rack

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`).