{"id":64266,"date":"2025-08-23T15:08:44","date_gmt":"2025-08-23T15:08:44","guid":{"rendered":""},"modified":"2025-09-02T21:31:31","modified_gmt":"2025-09-03T03:31:31","slug":"cve-2025-55205-namespace-label-injection-vulnerability-in-capsule-kubernetes-framework","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55205-namespace-label-injection-vulnerability-in-capsule-kubernetes-framework\/","title":{"rendered":"<strong>CVE-2025-55205: Namespace Label Injection Vulnerability in Capsule Kubernetes Framework<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this post, we will be shedding light on the recently discovered vulnerability identified as CVE-2025-55205. This vulnerability is present in Capsule, a multi-tenancy and policy-based framework for Kubernetes, and impacts versions up to and including 0.10.3. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53546-high-severity-vulnerability-in-folo-s-github-workflow\/\"  data-wpil-monitor-id=\"73400\">severity of this vulnerability<\/a> is high and it poses a significant threat to the fundamental security boundaries that Capsule is designed to enforce.<br \/>\nThis vulnerability, if exploited, could allow <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44957-ruckus-smartzone-authentication-bypass-vulnerability\/\"  data-wpil-monitor-id=\"74042\">authenticated tenant users to bypass<\/a> multi-tenant isolation and potentially access cross-tenant resources. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27055-memory-corruption-leads-to-potential-system-compromise-during-image-encoding\/\"  data-wpil-monitor-id=\"74299\">lead to system compromise<\/a> or data leakage, thereby posing a critical risk to organizations using this framework.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-55205<br \/>\nSeverity: High (CVSS 9.0)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74797\">Potential system compromise or data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3141399077\" 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>Capsule Kubernetes Framework | 0.10.3 and earlier<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43193-critical-memory-handling-vulnerability-in-macos\/\"  data-wpil-monitor-id=\"71925\">vulnerability arises due to an issue in the handling<\/a> of namespace labels within the Capsule Kubernetes framework. An authenticated user can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50240-sql-injection-vulnerability-in-nbcio-boot-v1-0-3\/\"  data-wpil-monitor-id=\"71924\">vulnerability by injecting<\/a> arbitrary labels into system namespaces, such as kube-system, default, or capsule-system. This action bypasses the multi-tenant isolation, giving the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-25268-unauthenticated-adjacent-attacker-accessing-api-endpoint\/\"  data-wpil-monitor-id=\"77702\">attacker potential access<\/a> to cross-tenant resources through TenantResource selectors.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2075077086\" 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 how the vulnerability might be exploited. This is a hypothetical HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-9408-server-side-request-forgery-attack-in-eclipse-glassfish\/\"  data-wpil-monitor-id=\"77403\">request that might be used to execute the attack<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/api\/v1\/namespaces\/kube-system HTTP\/1.1\nHost: target.example.com\nAuthorization: Bearer &lt;token&gt;\nContent-Type: application\/json\n{ &quot;metadata&quot;: { &quot;labels&quot;: { &quot;malicious_label&quot;: &quot;injected_value&quot; } } }<\/code><\/pre>\n<p>In this example, the attacker is making a POST request to the kube-system namespace, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-41530-critical-sql-injection-vulnerability-in-hospital-management-system-v4\/\"  data-wpil-monitor-id=\"75915\">injecting a malicious label into the system<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43588-out-of-bounds-write-vulnerability-in-substance3d-sampler-versions-5-0-and-earlier\/\"  data-wpil-monitor-id=\"73481\">vulnerability has been fixed in Capsule version<\/a> 0.10.4. Therefore, users are strongly recommended to update to this version or later as soon as possible. In the interim, a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can be used for temporary mitigation. Regularly monitoring system logs for any unusual activities or <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53499-critical-unauthorized-access-vulnerability-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72810\">unauthorized access<\/a> attempts can also help in early detection of potential threats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this post, we will be shedding light on the recently discovered vulnerability identified as CVE-2025-55205. This vulnerability is present in Capsule, a multi-tenancy and policy-based framework for Kubernetes, and impacts versions up to and including 0.10.3. The severity of this vulnerability is high and it poses a significant threat to the fundamental security [&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":[89],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64266","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-kubernetes"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64266","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=64266"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64266\/revisions"}],"predecessor-version":[{"id":70104,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64266\/revisions\/70104"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64266"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64266"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64266"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64266"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64266"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64266"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}