2442 matches found
CVE-2026-34830
A flaw was found in Rack. A remote attacker can exploit this vulnerability by injecting regular expression metacharacters into the X-Accel-Mapping request header. This improper input validation in Rack::Sendfilemapaccelpath allows the attacker to control the generated X-Accel-Redirect response...
CVE-2026-34826
A flaw was found in Rack. A remote attacker can exploit this by sending a specially crafted HTTP Range header containing numerous small, overlapping byte ranges. This can cause disproportionate consumption of CPU, memory, I/O, and bandwidth resources. The result is a Denial of Service DoS conditi...
CVE-2026-34786
A flaw was found in Rack. A remote attacker can exploit this vulnerability by sending a specially crafted request with a URL-encoded static path. This bypasses security-relevant response headers intended for static content, potentially leading to information disclosure or other unintended...
CVE-2026-34831
A flaw was found in Rack. A remote attacker can exploit this vulnerability by requesting a non-existent path containing percent-encoded UTF-8 characters. This causes Rack::Filesfail to incorrectly calculate the Content-Length header, using Stringsize instead of Stringbytesize for multibyte...
CVE-2026-34827
A flaw was found in Rack, a modular Ruby web server interface. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted multipart/form-data request. This request, containing numerous parts with lengthy backslash-escaped parameter values, causes the system to consu...
CVE-2026-34763
A flaw was found in Rack. A remote attacker could exploit a vulnerability in Rack::Directory's handling of root paths. When the configured root path contains special regular expression characters, the directory listing generation can fail to properly strip the path prefix. This can lead to the...
CVE-2026-32762
A flaw was found in Rack, a modular Ruby web server interface. This vulnerability arises from improper parsing of the RFC 7239 Forwarded header, where semicolons within quoted values are incorrectly interpreted as delimiters. An attacker can exploit this by crafting a malicious Forwarded header,...
CVE-2026-34230
A flaw was found in Rack. An unauthenticated attacker can exploit a vulnerability in the Rack::Utils.selectbestencoding method by sending a specially crafted Accept-Encoding header with numerous wildcard entries. This leads to quadratic time complexity during processing, causing disproportionate...
CVE-2026-34829
A flaw was found in Rack. An unauthenticated attacker can exploit this by sending a multipart/form-data request without a Content-Length header. This allows multipart parsing to continue without a total size limit, writing uploaded file parts directly to temporary files on disk. This unbounded di...
CVE-2026-34835
A flaw was found in Rack. A remote attacker could exploit this by sending a specially crafted Host header containing characters not permitted in standard hostnames. This malformed header bypasses hostname validation in applications using Rack::Request, leading to host header poisoning. This can...
CVE-2026-34785
A flaw was found in Rack. The Rack::Static component, which serves static files for web applications, uses a simple string prefix check to determine if a request should be served as a static file. This can lead to unintended information disclosure, as files with names that merely share a configur...
CVE-2026-26961
A flaw was found in Rack, a modular Ruby web server interface. A remote attacker can exploit a vulnerability in Rack::Multipart::Parser by crafting a Content-Type header with multiple boundary parameters. This allows the attacker to bypass security inspections performed by upstream proxies or Web...
Rack::Request accepts invalid Host characters, enabling host allowlist bypass
Summary Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, , and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be...
EUVD-2026-18478
Rack::Request accepts invalid Host characters, enabling host allowlist bypass...
GHSA-G2PF-XV49-M2H5 Rack::Request accepts invalid Host characters, enabling host allowlist bypass
Summary Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, , and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be...
GHSA-Q2WW-5357-X388 Rack has Content-Length mismatch in Rack::Files error responses
Summary Rack::Filesfail sets the Content-Length response header using Stringsize instead of Stringbytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the...
EUVD-2026-18392
Rack has Content-Length mismatch in Rack::Files error responses...
Rack has Content-Length mismatch in Rack::Files error responses
Summary Rack::Filesfail sets the Content-Length response header using Stringsize instead of Stringbytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the...
GHSA-QV7J-4883-HWH7 Rack::Sendfile header-based X-Accel-Mapping regex injection enables unauthorized X-Accel-Redirect
Summary Rack::Sendfilemapaccelpath interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex...