{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-34824/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["denial-of-service","websocket","cve-2026-34824"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eMesop, a Python-based UI framework, is vulnerable to a denial-of-service (DoS) attack due to uncontrolled resource consumption in its WebSocket implementation. Specifically, versions 1.2.3 and 1.2.4 are affected. An unauthenticated attacker can exploit this vulnerability (CVE-2026-34824) by sending a rapid succession of WebSocket messages. The server, in turn, spawns an unbounded number of operating system threads to handle these messages. This leads to thread exhaustion and Out of Memory (OOM) errors, effectively crashing the Mesop application and causing a complete DoS. The vulnerability was patched in version 1.2.5, so upgrading is the primary mitigation. This DoS can impact any application built on the vulnerable versions of the framework.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a Mesop application running a vulnerable version (1.2.3 or 1.2.4).\u003c/li\u003e\n\u003cli\u003eThe attacker establishes a WebSocket connection to the Mesop application server.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts and sends a high volume of WebSocket messages to the server.\u003c/li\u003e\n\u003cli\u003eThe server attempts to process each message by spawning a new OS thread.\u003c/li\u003e\n\u003cli\u003eThe rapid influx of messages causes the server to spawn threads at an unsustainable rate.\u003c/li\u003e\n\u003cli\u003eThe server\u0026rsquo;s thread pool becomes exhausted, preventing it from servicing legitimate requests.\u003c/li\u003e\n\u003cli\u003eThe server\u0026rsquo;s memory usage increases dramatically as it attempts to manage the excessive threads.\u003c/li\u003e\n\u003cli\u003eThe server runs out of memory (OOM) and crashes, resulting in a denial-of-service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-34824 results in a complete denial-of-service for applications built on the Mesop framework. This can lead to downtime, loss of productivity, and potential reputational damage. The impact is particularly severe for critical applications that rely on the Mesop framework for availability. While specific victim numbers are unavailable, any organization using Mesop versions 1.2.3 or 1.2.4 is potentially vulnerable.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Mesop to version 1.2.5 or later to patch CVE-2026-34824.\u003c/li\u003e\n\u003cli\u003eImplement rate limiting on WebSocket connections to mitigate rapid message flooding.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Mesop Excessive WebSocket Connections\u003c/code\u003e to identify potential exploitation attempts based on network connection patterns.\u003c/li\u003e\n\u003cli\u003eMonitor server resource utilization (CPU, memory, threads) for Mesop applications and alert on unusual spikes to proactively identify potential DoS conditions.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-04T12:00:00Z","date_published":"2026-04-04T12:00:00Z","id":"/briefs/2026-04-mesop-dos/","summary":"An unauthenticated attacker can exploit an uncontrolled resource consumption vulnerability in Mesop versions 1.2.3 to 1.2.4 by sending a rapid succession of WebSocket messages, leading to thread exhaustion and a denial-of-service condition.","title":"Mesop Framework WebSocket Denial-of-Service Vulnerability (CVE-2026-34824)","url":"https://feed.craftedsignal.io/briefs/2026-04-mesop-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-34824","version":"https://jsonfeed.org/version/1.1"}