CVE-2026-5733

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,149.0.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,149.0.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-13T16:07:46.699929+00:00", "value": {"mitigation_remediation": ["Update Mozilla Firefox to version 149.0.2 or later", "Update Mozilla Thunderbird to version 149.0.2 or later", "If an immediate update is not possible, disable the WebGPU feature by setting the corresponding configuration option to false in the browser\u2019s configuration page"], "summary": {"action": "Immediate Patch", "impact": "Arbitrary code execution via WebGPU"}, "threat_synthesis": {"affected_systems": "The flaw affects Mozilla Firefox and Mozilla Thunderbird browsers running versions prior to 149.0.2. Any user running a vulnerable build of these applications is potentially exposed until they upgrade to the fixed releases.", "description_and_impact": "The vulnerability arises from improper handling of boundary conditions within the Graphics: WebGPU component, creating an opportunity for memory corruption. The issue is classified as a buffer overflow and an out\u2011of\u2011bounds write, allowing an attacker who can introduce malicious WebGPU instructions to overwrite critical memory and potentially execute arbitrary code. The impact is severe, threatening the confidentiality, integrity, and availability of the affected system.", "risk_and_exploitability": "With a CVSS score of 8.8, the vulnerability is considered high severity. The EPSS score of less than 1% indicates a low expected exploitation probability, and it is not yet listed in CISA\u2019s KEV catalog. Based on the nature of the flaw and its location in a web\u2011based graphics API, the attack vector is inferred to be remote, most likely through a malicious webpage or email that triggers the WebGPU component."}}}}, "created": "2026-04-08T19:38:05.220193+00:00", "updated": "2026-04-14T16:41:02.246676+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$thunderbird"]}