{"id":75976,"date":"2025-09-18T15:53:26","date_gmt":"2025-09-18T15:53:26","guid":{"rendered":""},"modified":"2025-10-22T17:02:07","modified_gmt":"2025-10-22T23:02:07","slug":"cve-2025-9556-server-side-template-injection-vulnerability-in-langchaingo","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9556-server-side-template-injection-vulnerability-in-langchaingo\/","title":{"rendered":"<strong>CVE-2025-9556: Server Side Template Injection Vulnerability in Langchaingo<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The CVE-2025-9556 vulnerability is a critical flaw identified in the Langchaingo software infrastructure. This vulnerability has a high impact, posing severe risks to system integrity, data confidentiality, and availability. Langchaingo, a popular language processing tool, ends up the victim due to its support of jinja2 syntax which is parsed using gonja library v1.5.3. This compromise could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7775-critical-memory-overflow-vulnerability-in-netscaler-adc-and-gateway-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"83811\">lead to potential system<\/a> intrusion or data leakage, making it a matter of grave concern for organizations and individual users who rely on this software for their daily operations.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54493-critical-buffer-overflow-vulnerability-in-the-biosig-project-libbiosig-3-9-0\/\"  data-wpil-monitor-id=\"83424\">vulnerability is highly critical<\/a>, given its CVSS Severity Score of 9.8. It is of utmost importance that <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5060-authentication-bypass-vulnerability-in-bravis-user-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"85253\">users and administrators understand this vulnerability<\/a>, its implications, and the necessary steps for mitigation.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-9556<br \/>\nSeverity: Critical (9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9253-stack-based-buffer-overflow-on-linksys-wi-fi-range-extenders-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"84286\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-935924900\" 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>Langchaingo | All versions that use gonja library v1.5.3<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of the &#8216;extends&#8217; and &#8216;include&#8217; syntax in Gonja, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-59340-jinjava-template-engine-vulnerability-leading-to-potential-remote-code-execution\/\"  data-wpil-monitor-id=\"90405\">templating engine<\/a> used by Langchaingo. When Langchaingo parses a prompt using jinja2 syntax, an attacker can insert a statement that instructs the software to read the &#8220;etc\/passwd&#8221; file. This file contains sensitive data, including user account information, which can be utilized to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7051-unauthorized-access-and-manipulation-of-syslog-configuration-in-n-central\/\"  data-wpil-monitor-id=\"84598\">unauthorized access<\/a> and control of the system.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3574682836\" 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>A malicious actor might exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50972-sql-injection-vulnerability-in-abantecart-1-4-2-with-a-high-severity-score\/\"  data-wpil-monitor-id=\"83489\">vulnerability by injecting<\/a> harmful jinja2 statements into the prompts processed by Langchaingo. It could be similar to this conceptual example:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/langchaingo\/prompt HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;prompt&quot;: &quot;{{ &#039;\/etc\/passwd&#039; | include }}&quot; }<\/code><\/pre>\n<p>In this example, the attacker uses the &#8216;include&#8217; function to instruct the server to read and return the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4414-critical-php-remote-file-inclusion-vulnerability-in-cmsmasters-content-composer\/\"  data-wpil-monitor-id=\"91064\">contents of the &#8220;\/etc\/passwd&#8221; file<\/a>. This file could then be analyzed to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27215-unauthorized-system-modification-vulnerability-in-unifi-display-cast-devices\/\"  data-wpil-monitor-id=\"84895\">unauthorized access to the system<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52930-high-risk-memory-corruption-vulnerability-in-sail-image-decoding-library\/\"  data-wpil-monitor-id=\"90879\">risks posed by this vulnerability<\/a>, users are urged to apply patches provided by the vendor as soon as they become available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary solution. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9791-critical-vulnerability-in-tenda-ac20-16-03-08-05-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"85000\">systems can detect and block attempts to exploit the vulnerability<\/a>, thereby limiting potential damage. Regular monitoring and system audits are also recommended to identify any unusual activity or intrusions promptly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The CVE-2025-9556 vulnerability is a critical flaw identified in the Langchaingo software infrastructure. This vulnerability has a high impact, posing severe risks to system integrity, data confidentiality, and availability. Langchaingo, a popular language processing tool, ends up the victim due to its support of jinja2 syntax which is parsed using gonja library v1.5.3. This [&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":[78],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-75976","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-injection"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75976","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=75976"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75976\/revisions"}],"predecessor-version":[{"id":84081,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75976\/revisions\/84081"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=75976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=75976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=75976"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=75976"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=75976"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=75976"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=75976"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=75976"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=75976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}