{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/webgpu/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.1,"id":"CVE-2026-40393"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve","vulnerability","webgpu"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-40393 is a critical vulnerability affecting Mesa, an open-source graphics library, specifically impacting the WebGPU component. The vulnerability stems from insufficient validation of the amount of data to be allocated, allowing an attacker to influence the allocation size via an untrusted party. This value is subsequently passed to the \u003ccode\u003ealloca\u003c/code\u003e function, resulting in a heap out-of-bounds write. The vulnerability affects Mesa versions prior to 25.3.6 and 26 prior to 26.0.1. Successful exploitation could allow for arbitrary code execution within the context of the application using the vulnerable Mesa library. This is a significant concern for systems utilizing Mesa for WebGPU rendering, including potentially web browsers and other graphics-intensive applications.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker provides a malicious WebGPU input that influences the size of a data allocation.\u003c/li\u003e\n\u003cli\u003eThe application using the vulnerable Mesa library processes the malicious WebGPU input.\u003c/li\u003e\n\u003cli\u003eThe size parameter, controlled (at least partially) by the attacker, is passed to the \u003ccode\u003ealloca\u003c/code\u003e function within the WebGPU component of Mesa.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ealloca\u003c/code\u003e allocates a buffer on the stack based on the attacker-controlled size.\u003c/li\u003e\n\u003cli\u003eDue to missing or insufficient validation, the allocated buffer size is smaller than the actual data being written.\u003c/li\u003e\n\u003cli\u003eA write operation occurs to this buffer, exceeding its boundaries (out-of-bounds write).\u003c/li\u003e\n\u003cli\u003eThe out-of-bounds write corrupts adjacent memory regions on the stack, potentially overwriting critical data or return addresses.\u003c/li\u003e\n\u003cli\u003eThe corrupted memory leads to application crash or, in more sophisticated attacks, allows the attacker to hijack program control and execute arbitrary code.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-40393 can lead to arbitrary code execution within the context of the application using the vulnerable Mesa library. This could allow an attacker to gain control of the affected system, potentially leading to data theft, system compromise, or denial-of-service. Given the wide usage of Mesa in Linux systems and potentially other platforms for graphics rendering, the impact could be significant if exploited widely.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Mesa to version 25.3.6 or later, or version 26.0.1 or later to patch CVE-2026-40393.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious requests containing unusual WebGPU commands as a proactive measure (see example rule below).\u003c/li\u003e\n\u003cli\u003eImplement input validation on applications that use the Mesa library to ensure that data passed to the WebGPU component is within expected bounds.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-12T19:16:20Z","date_published":"2026-04-12T19:16:20Z","id":"/briefs/2026-04-mesa-webgpu-oob-write/","summary":"An out-of-bounds write vulnerability exists in Mesa versions before 25.3.6 and 26 before 26.0.1 due to an untrusted allocation size in WebGPU, potentially leading to code execution.","title":"Mesa WebGPU Out-of-Bounds Write Vulnerability (CVE-2026-40393)","url":"https://feed.craftedsignal.io/briefs/2026-04-mesa-webgpu-oob-write/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve-2026-4678","use-after-free","chrome","webgpu"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-4678 is a use-after-free vulnerability impacting Google Chrome versions earlier than 146.0.7680.165. The vulnerability resides within the WebGPU component, a modern graphics API. An unauthenticated, remote attacker can exploit this flaw by enticing a user to open a specially crafted HTML page. Successful exploitation allows the attacker to execute arbitrary code inside the Chrome sandbox. The Chromium project rates this as a High severity issue due to the potential for arbitrary code…\u003c/p\u003e\n","date_modified":"2026-03-24T01:17:03Z","date_published":"2026-03-24T01:17:03Z","id":"/briefs/2026-03-chrome-webgpu-uaf/","summary":"A use-after-free vulnerability in Google Chrome's WebGPU component (CVE-2026-4678) allows a remote attacker to execute arbitrary code within a sandbox by crafting a malicious HTML page, affecting Chrome versions prior to 146.0.7680.165.","title":"Google Chrome WebGPU Use-After-Free Vulnerability (CVE-2026-4678)","url":"https://feed.craftedsignal.io/briefs/2026-03-chrome-webgpu-uaf/"}],"language":"en","title":"CraftedSignal Threat Feed — Webgpu","version":"https://jsonfeed.org/version/1.1"}