{"id":53829,"date":"2025-06-20T23:57:44","date_gmt":"2025-06-20T23:57:44","guid":{"rendered":""},"modified":"2025-10-02T23:37:11","modified_gmt":"2025-10-03T05:37:11","slug":"cve-2025-49794-critical-use-after-free-vulnerability-in-libxml2","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49794-critical-use-after-free-vulnerability-in-libxml2\/","title":{"rendered":"<strong>CVE-2025-49794: Critical Use-After-Free Vulnerability in Libxml2<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity community is currently facing a serious vulnerability in libxml2, a widely-used software library for parsing and manipulating XML documents. The vulnerability, identified as CVE-2025-49794, is a use-after-free flaw that potentially allows malicious actors to compromise systems using a carefully crafted XML document. This vulnerability is particularly dangerous due to the widespread usage of the libxml2 library in various software applications, making a large number of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40912-critical-vulnerability-in-cryptx-for-perl-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"60792\">systems potentially<\/a> susceptible to breaches.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-49794<br \/>\nSeverity: Critical (CVSS 9.1)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5978-critical-vulnerability-in-tenda-fh1202-1-2-0-14-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"61021\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1865258516\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Libxml2 | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49137-critical-vulnerability-in-hax-cms-php-prior-to-version-11-0-0\/\"  data-wpil-monitor-id=\"61952\">versions prior<\/a> to patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-49842-linux-kernel-use-after-free-vulnerability-in-snd-soc-exit\/\"  data-wpil-monitor-id=\"60164\">vulnerability stems from a use-after-free<\/a> issue in libxml2 when parsing XPath elements under specific circumstances. This issue occurs when the XML schematron includes the <sch:name path=\"...\"\/> schema elements. A malicious actor can exploit this flaw by crafting a malicious XML document and feeding it as <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1041-critical-improper-input-validation-vulnerability-in-avaya-call-management-system\/\"  data-wpil-monitor-id=\"60454\">input to an application that uses the vulnerable<\/a> libxml2 library. This action can result in a crash of the application, or even more concerning, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49847-buffer-overflow-vulnerability-in-llama-cpp-leading-to-potential-code-execution\/\"  data-wpil-monitor-id=\"62651\">lead to unexpected and potentially<\/a> harmful behavior, such as a system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1517597185\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Below is a conceptual example of an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31039-unveiling-the-xml-external-entity-reference-vulnerability-in-pixelgrade-category-icon\/\"  data-wpil-monitor-id=\"60283\">XML document that might be used to exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;\n&lt;root&gt;\n&lt;sch:name path=&quot;...&quot;&gt;\n&lt;!-- Malicious payload here --&gt;\n&lt;\/sch:name&gt;\n&lt;\/root&gt;<\/code><\/pre>\n<p>In this theoretical example, the malicious payload would be placed in the path field, and this document would be used as input for an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49199-application-backup-zips-vulnerability-and-system-compromise\/\"  data-wpil-monitor-id=\"61277\">application utilizing the vulnerable<\/a> libxml2 library.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>While vendors are working on patches to address this issue, it is recommend that <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5485-a-critical-vulnerability-pertaining-to-user-name-enumeration-in-web-management-interfaces\/\"  data-wpil-monitor-id=\"61511\">users implement a Web<\/a> Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation measures. These systems can help detect and block malicious XML documents and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49155-uncontrolled-search-path-vulnerability-in-trend-micro-apex-one-data-loss-prevention-module\/\"  data-wpil-monitor-id=\"62519\">prevent them from being processed by the vulnerable<\/a> libxml2 library. Users are advised to update their libxml2 library to the patched version as soon as it becomes <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-26383-critical-vulnerability-in-amd-tee-puts-system-integrity-and-data-availability-in-jeopardy\/\"  data-wpil-monitor-id=\"88039\">available to permanently rectify this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity community is currently facing a serious vulnerability in libxml2, a widely-used software library for parsing and manipulating XML documents. The vulnerability, identified as CVE-2025-49794, is a use-after-free flaw that potentially allows malicious actors to compromise systems using a carefully crafted XML document. This vulnerability is particularly dangerous due to the widespread usage [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53829","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=53829"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53829\/revisions"}],"predecessor-version":[{"id":80855,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53829\/revisions\/80855"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=53829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=53829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=53829"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=53829"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=53829"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=53829"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=53829"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=53829"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=53829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}