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CVE-2025-61772

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Date: October 7, 2025

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").

Severity Score

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Top Fix

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Upgrade Version

Upgrade to version rack - 2.2.19;rack - 3.1.17;rack - 3.2.2;https://github.com/rack/rack.git - 2.2.19;https://github.com/rack/rack.git - v3.1.17;https://github.com/rack/rack.git - v3.2.2

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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