{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/emmett/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.1,"id":"CVE-2026-39847"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["path-traversal","web-application","emmett","cve-2026-39847"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe Emmett web framework, a full-stack Python framework, is susceptible to a path traversal vulnerability affecting versions 2.5.0 to prior to 2.8.1. Specifically, the RSGI static handler for Emmett\u0026rsquo;s internal assets (/\u003cstrong\u003eemmett\u003c/strong\u003e paths) does not properly sanitize user-supplied input, leading to CVE-2026-39847. By crafting malicious URLs containing \u0026ldquo;../\u0026rdquo; sequences, an unauthenticated attacker can bypass directory restrictions and access sensitive files residing outside the designated assets directory. Successful exploitation allows attackers to potentially read application source code, configuration files, or other sensitive data. Emmett users are urged to upgrade to version 2.8.1 or later to remediate this vulnerability. The vulnerability was reported on April 7th, 2026.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Emmett web application running a version between 2.5.0 and 2.8.1.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP GET request targeting a static asset under the \u003ccode\u003e/__emmett__\u003c/code\u003e path.\u003c/li\u003e\n\u003cli\u003eThe crafted URL includes \u0026ldquo;../\u0026rdquo; sequences to traverse up the directory structure from the intended assets directory. For example: \u003ccode\u003e/__emmett__/../../../../etc/passwd\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe web server receives the request and passes it to the vulnerable RSGI static handler.\u003c/li\u003e\n\u003cli\u003eDue to the lack of input sanitization, the handler processes the \u0026ldquo;../\u0026rdquo; sequences, allowing the attacker to navigate outside the assets directory.\u003c/li\u003e\n\u003cli\u003eThe handler attempts to read the file specified in the manipulated path (e.g., \u003ccode\u003e/etc/passwd\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe server returns the contents of the requested file in the HTTP response.\u003c/li\u003e\n\u003cli\u003eThe attacker obtains sensitive information from the server, potentially including configuration files, source code, or credentials.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this path traversal vulnerability (CVE-2026-39847) allows an attacker to read arbitrary files on the server hosting the Emmett web application. This can lead to the exposure of sensitive information such as application source code, configuration files containing database credentials, or even system files. The impact can range from information disclosure to complete compromise of the web application and potentially the underlying server. The severity is rated as critical with a CVSS v3.1 score of 9.1.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Emmett to version 2.8.1 or later to patch CVE-2026-39847.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Emmett Path Traversal Attempts\u0026rdquo; to your SIEM to identify exploitation attempts.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious URLs containing \u0026ldquo;../\u0026rdquo; sequences targeting the \u003ccode\u003e/__emmett__\u003c/code\u003e path to identify potential exploit attempts.\u003c/li\u003e\n\u003cli\u003eImplement web application firewall (WAF) rules to block requests containing path traversal sequences.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-07T22:16:23Z","date_published":"2026-04-07T22:16:23Z","id":"/briefs/2026-04-emmett-path-traversal/","summary":"Emmett web framework versions 2.5.0 to before 2.8.1 are vulnerable to path traversal attacks (CVE-2026-39847), allowing attackers to read arbitrary files outside the intended assets directory using manipulated URLs.","title":"Emmett Web Framework Path Traversal Vulnerability (CVE-2026-39847)","url":"https://feed.craftedsignal.io/briefs/2026-04-emmett-path-traversal/"}],"language":"en","title":"CraftedSignal Threat Feed — Emmett","version":"https://jsonfeed.org/version/1.1"}