{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6758", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-04-21T12:40:53.328Z", "datePublished": "2026-04-21T12:40:53.661Z", "dateUpdated": "2026-04-21T17:47:52.713Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "150", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150."}]}], "title": "Use-after-free in the JavaScript: WebAssembly component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2013619"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}], "credits": [{"lang": "en", "value": "Evyatar Ben Asher, Keane Lucas, Nicholas Carlini, Newton Cheng, Daniel Freeman, Alex Gaynor, and Joel Weinberger using Claude from Anthropic"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-21T12:40:53.661Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-21T17:47:27.967573Z", "id": "CVE-2026-6758", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T17:47:52.713Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150."}], "id": "CVE-2026-6758", "lastModified": "2026-04-21T15:48:44.543", "metrics": {}, "published": "2026-04-21T13:16:21.770", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2013619"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Undergoing Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[150,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "created": "2026-04-21T16:45:15.077469+00:00", "updated": "2026-04-21T16:45:15.077500+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}