CVE-2026-53538 Python-Multipart: Semicolon treated as querystring field separator enables parameter smuggling

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse since the CVE-2021-23336 fix treat only...

CVE-2026-53539 Python-Multipart: Quadratic-time querystring parsing with semicolon separators causes CPU denial of service

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, 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...

CVE-2026-53539

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, 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...

CVE-2026-53539 Python-Multipart: Quadratic-time querystring parsing with semicolon separators causes CPU denial of service

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, 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...

CVE-2026-53539

CVE-2026-53539 (Python-Multipart) affects the Python-Multipart streaming multipart parser. Prior to 0.0.30, parsing application/x-www-form-urlencoded bodies used a two-step field separator lookup, causing an O(B^2) worst-case workload per chunk when semicolon is used as the separator and no amper...

CVE-2026-53539

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, 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...

CVE-2026-50559

Quarkus is a Java framework for building cloud-native applications. Prior to versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2, Quarkus HTTP path-based authorization policies can be bypassed using encoded semicolons %3B to smuggle matrix parameters past the security layer,...

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...

Inefficient Algorithmic Complexity

Overview python-multipart is an A streaming multipart parser for Python Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the QuerystringParser function when parsing application/x-www-form-urlencoded bodies containing semicolon-separated fields. An attacker...

python-multipart: Semicolon treated as querystring field separator enables parameter smuggling

Summary QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse since the CVE-2021-23336 fix treat only & as a separator. This creates a parser differential: the same bytes...

PT-2026-49571

Name of the Vulnerable Software and Affected Versions python-multipart versions prior to 0.0.30 Description A quadratic complexity issue exists when parsing application/x-www-form-urlencoded bodies. The QuerystringParser performs a two-step lookup for field separators, scanning the entire remaini...

PT-2026-49570

Name of the Vulnerable Software and Affected Versions Python-Multipart versions prior to 0.0.30 Description The QuerystringParser treated the semicolon ; as a field separator in application/x-www-form-urlencoded bodies, in addition to the ampersand &. This deviates from the WHATWG URL standard,...

EUVD-2026-35417

A flaw was found in 389 Directory Server. The LDIF parser reads past the end of a heap buffer when processing attribute types with trailing semicolons during database import, causing an out-of-bounds read detectable under memory instrumentation...

CVE-2026-33808

Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or...

Astra Linux – Vulnerability in Python-Django, Python 2.7

Packages containing “python/cpython” from versions 0 and earlier, including 3.6.13, 3.7.0 and earlier than 3.7.10, 3.8.0 and earlier than 3.8.8, 3.9.0 and earlier than 3.9.2, are vulnerable to Web Cache Poisoning via “urllib.parse.parseqsl” and “urllib.parse.parseqs”. This vulnerability occurs du...

Improper Authorization

@fastify/express is vulnerable to Improper Authorization. The vulnerability is due to inconsistent URL normalization between Fastify and Express middleware, which allows an unauthenticated attacker to manipulate URL paths using duplicate slashes or semicolon delimiters to bypass path-based...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: python-bottle (UTSA-2026-017473)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017473 advisory. 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...

CVE-2026-39852

Quarkus is a Java framework for building cloud-native applications. In versions prior to 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2, a path normalization inconsistency between the security layer and the routing layer allows unauthenticated or lower-privileged users to bypass HTTP...

CVE-2026-39852

Summary of CVE-2026-39852 : Quarkus exposes an authorization bypass due to path normalization mismatch between the security layer and RESTEasy Reactive routing, which preserves semicolons (matrix parameters) in the raw URL while routing drops them for endpoint matching. This allows unauthenticate...