{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/infinite-loop/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Snappier (\u003c= 1.3.0)"],"_cs_severities":["medium"],"_cs_tags":["denial-of-service","compression","infinite-loop"],"_cs_type":"advisory","_cs_vendors":["NuGet"],"content_html":"\u003cp\u003eThe Snappier library, specifically the \u003ccode\u003eSnappyStream\u003c/code\u003e class, is susceptible to a denial-of-service vulnerability when decompressing malformed Snappy streams in framed format. An attacker who can control the input to the \u003ccode\u003eSnappyStream\u003c/code\u003e decompression process can trigger an infinite loop, leading to excessive CPU consumption and thread exhaustion. This issue affects applications using Snappier version 1.3.0 and earlier. The vulnerability stems from an unhandled condition in the decompression logic, causing the \u003ccode\u003eSnappyStreamDecompressor.Decompress\u003c/code\u003e method to repeatedly call \u003ccode\u003eCrc32CAlgorithm.Append\u003c/code\u003e without termination. Standard exception handling mechanisms (try/catch blocks) are ineffective in preventing the hang, making it difficult to mitigate without terminating the affected process.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malformed Snappy compressed data stream (as small as 15 bytes).\u003c/li\u003e\n\u003cli\u003eThe attacker sends this malformed stream to a service or application using the Snappier library for decompression.\u003c/li\u003e\n\u003cli\u003eThe application instantiates a \u003ccode\u003eSnappyStream\u003c/code\u003e object with \u003ccode\u003eCompressionMode.Decompress\u003c/code\u003e to handle the incoming data stream.\u003c/li\u003e\n\u003cli\u003eThe application calls \u003ccode\u003eCopyTo()\u003c/code\u003e or a similar method on the \u003ccode\u003eSnappyStream\u003c/code\u003e to decompress the data.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eSnappyStreamDecompressor.Decompress\u003c/code\u003e method is invoked internally.\u003c/li\u003e\n\u003cli\u003eDue to the malformed input, an infinite loop occurs within \u003ccode\u003eSnappyStreamDecompressor.Decompress\u003c/code\u003e involving repeated calls to \u003ccode\u003eCrc32CAlgorithm.Append\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eA single CPU core is consumed at 100% by the affected thread.\u003c/li\u003e\n\u003cli\u003eThe application hangs indefinitely, requiring termination to recover.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability results in a denial-of-service condition. An attacker can remotely trigger the infinite loop by sending malicious data to any application that utilizes the vulnerable \u003ccode\u003eSnappier.SnappyStream\u003c/code\u003e for decompression. This can lead to resource exhaustion, application unavailability, and potentially impact other services relying on the same system. Since the \u003ccode\u003etry/catch\u003c/code\u003e doesn\u0026rsquo;t work, the service will remain inoperable until manually restarted.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade to a patched version of the Snappier library that addresses CVE-2026-44302.\u003c/li\u003e\n\u003cli\u003eImplement input validation and sanitization on data streams prior to decompression using \u003ccode\u003eSnappier.SnappyStream\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eMonitor CPU usage for processes utilizing the Snappier library. Deploy the process monitoring rule below to detect potential exploitation attempts based on high CPU usage.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-06T20:53:23Z","date_published":"2026-05-06T20:53:23Z","id":"/briefs/2026-05-snappier-dos/","summary":"Snappier versions 1.3.0 and earlier are vulnerable to a denial-of-service condition where a malformed Snappy stream input to `SnappyStream` decompression causes an infinite loop, consuming a thread until the process is terminated.","title":"Snappier SnappyStream Decompression Infinite Loop Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-snappier-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Infinite-Loop","version":"https://jsonfeed.org/version/1.1"}