python-multipart: Quadratic-time querystring parsing with semicolon separators causes CPU denial of service

Summary When parsing application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step lookup: it first scanned the entire remaining buffer for &, and only when no & existed anywhere ahead did it fall back to scanning for ;. For a body that uses ; as the...

GHSA-5RVQ-CXJ2-64VF python-multipart: Quadratic-time querystring parsing with semicolon separators causes CPU denial of service

Summary When parsing application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step lookup: it first scanned the entire remaining buffer for &, and only when no & existed anywhere ahead did it fall back to scanning for ;. For a body that uses ; as the...

Parameter-parsing Bypass

Rack is vulnerable to a parameter-parsing Bypass. The vulnerability is due to Rack::QueryParser enforcing its paramslimit only for parameters separated by & while still splitting on both & and ;, which allows an attacker to bypass the parameter count limit by using ; separators to submit excessiv...

EUVD-2025-31103

Malicious code in bioql PyPI...

SUSE CVE-2025-59830

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its paramslimit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters...

CVE-2025-59830 Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its paramslimit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters...

SUSE CVE-2021-23336

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parseqsl and urllib.parse.parseqs by using a vector called parameter cloaking. When the attacker can...

PYSEC-2021-129

The package bottle from 0 and before 0.12.19 are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon ;, they can cause a difference in the interpretation of the request between the proxy running with...