CVE-2026-4224 Stack overflow parsing XML with deeply nested DTD content models

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs...

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs...

CVE-2026-4224

CVE-2026-4224 is a CPython vulnerability: when an Expat parser with a registered ElementDeclHandler parses an inline DTD containing a deeply nested content model, a C stack overflow can occur. The connected advisories confirm this affects multiple Python3 series (3.9, 3.11, 3.12, 3.13, 3.14) and ...

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs...

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs...

Siemens S7-1500 and SCALANCE Allocation of Resources Without Limits or Throttling (CVE-2025-59375)

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc...

Important: Red Hat Security Advisory: spice-client-win security update

An update for spice-client-win is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is...

PT-2026-25791

Name of the Vulnerable Software and Affected Versions Expat affected versions not specified Description The Expat parser, when used with a registered ElementDeclHandler, is susceptible to a C stack overflow when processing an inline document type definition with a deeply nested content model. Thi...

expat: internal entity expansion

expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XMLSetEntityDeclHandler function, which allows remote attackers to cause a denial of service resource consumption, send HTTP requests to intranet servers, or read arbitrary files via a...

Siemens SIMATIC S7-1500 Improper Restriction of XML External Entity Reference (CVE-2018-20843)

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing enough to be usable for denial-of-service attacks. This plugin only works with Tenable.ot. Please visit...

Siemens SIMATIC S7-1500 Improper Restriction of XML External Entity Reference (CVE-2013-0340)

expat 2.1.0 and earlier does not properly handle entities expansion unless an application developer uses the XMLSetEntityDeclHandler function, which allows remote attackers to cause a denial of service resource consumption, send HTTP requests to intranet servers, or read arbitrary files via a...

OESA-2025-2565 expat security update

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial. Security Fixes: A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML...

Expat 安全漏洞

Expat is a fast streaming XML parser from Expat open source. A security vulnerability exists in Expat versions prior to 2.7.2, which stems from a small document parsing that may trigger a large dynamic memory allocation...

expat security update

An update is available for expat. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list Expat is a C library for parsing XML documents. Security Fixes: libexpat:...

USN-7001-2: xmltok library vulnerabilities

USN-7001-1 fixed vulnerabilities in xmltol library. This update provides the corresponding updates for Ubuntu 24.04 LTS. Original advisory details: Shang-Hung Wan discovered that Expat, contained within the xmltok library, did not properly handle certain function calls when a negative input lengt...

PT-2024-3924

Name of the Vulnerable Software and Affected Versions: libexpat versions through 2.5.0 Description: The issue is related to the incorrect limitation of recursive references to objects in DTD, which can lead to a denial of service. This is caused by recursive XML Entity Expansion if XML DTD is...

SUSE CVE-2009-1955

The expat XML parser in the aprxml interface in xml/aprxml.c in Apache APR-util before 1.3.7, as used in the moddav and moddavsvn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service memory consumption via a crafted XML document containing a large number of nest...

SUSE CVE-2016-5300

The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context-dependent attackers to cause a denial of service CPU consumption via crafted identifiers in an XML document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876...

UBUNTU-CVE-2022-0217

It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML features allowed in parsed XML data. Given suitable attacker input, this results in expansion of recursive entity references from DTDs CWE-776. In addition, depending on the libexpa...

Expat 输入验证错误漏洞

Expat is a fast streaming XML parser written in C. An integer overflow vulnerability exists prior to Expat 2.4.5, which stems from the presence of an integer overflow in storeRawNames. No detailed vulnerability details are currently available...