Astra Linux – Vulnerability in Ruby-Rack

There is a possible denial-of-service vulnerability in Rack versions 2.0.9.1, 2.1.4.1, and 2.2.3.1, specifically in the multipart parsing component of Rack...

Security Bulletin: Multiple vulnerabilities in IBM Aspera Console

Summary Multiple vulnerabilities were addressed in IBM Aspera Console version 3.4.10 Vulnerability Details CVEID:CVE-2026-26961 DESCRIPTION: Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser extracts the boundary parameter from...

GHSA-8VQR-QJWX-82MW Rack's multipart parsing without Content-Length header allows unbounded chunked file uploads

Summary Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENTLENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size...

GHSA-RX22-G9MX-QRHV Rack's improper unfolding of folded multipart headers preserves CRLF in parsed parameter values

Summary 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,...

EUVD-2026-18417

Rack's improper unfolding of folded multipart headers preserves CRLF in parsed parameter values...

Denial of Service (DoS)

Overview rack is a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between the so-called middleware into a singl...

CVE-2026-34827

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parserhandlemimehead parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated Stringindex searches combined with...

CVE-2026-34829

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENTLENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfe...

CVE-2026-26961

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser extracts the boundary parameter from multipart/form-data using a greedy regular expression. When a Content-Type header contains multiple boundary parameters, Rack selects the last one...

CVE-2026-26962: Improper Neutralization of CRLF Sequences

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 o...

CVE-2026-34827: Inefficient Algorithmic Complexity

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parserhandlemimehead parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated Stringindex searches combined with...

PT-2026-29923

Summary 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,...

CVE-2026-34829: Uncontrolled Resource Consumption

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENTLENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfe...

Rack's multipart parsing without Content-Length header allows unbounded chunked file uploads

Summary Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENTLENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size...

CVE-2026-26961: Interpretation Conflict

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser extracts the boundary parameter from multipart/form-data using a greedy regular expression. When a Content-Type header contains multiple boundary parameters, Rack selects the last one...

Denial Of Service

rack is vulnerable to Denial Of Service. The vulnerability is due to unbounded buffering of the multipart preamble in Rack::Multipart::Parser, where attackers can send extremely large preamble data before the first boundary, causing excessive memory consumption and potential OOM-induced DoS...

Denial Of Service (DoS)

rack is vulnerable to Denial Of Service. The vulnerability is due to unbounded in-memory storage of non-file multipart form fields in Rack::Multipart::Parser, where attackers can send extremely large text fields that consume process memory and trigger OOM conditions, leading to DoS...

Rack::Multipart::Parser DoS

The vulnerability of the Rack::Multipart::Parser class in module interfaces between web servers and Rack web applications involves an uncontrolled resource consumption. Exploiting this vulnerability can allow a malicious actor to cause service failures...

rack: Rack memory exhaustion denial of service

A denial of service flaw has been found in the rubygems rack package. 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...

Rack::Multipart::Parser DoS

The vulnerability of the Rack::Multipart::Parser class in module interfaces between web servers and Rack web applications involves an uncontrolled resource consumption. Exploiting this vulnerability can allow a malicious actor to cause service failures...