CVE-2025-43421

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{"affected": [{"affectedData": [{"product": "Safari", "vendor": "Apple", "versions": [{"lessThan": "26.1", "status": "affected", "version": "0", "versionType": "custom"}]}, {"product": "iOS and iPadOS", "vendor": "Apple", "versions": [{"lessThan": "26.1", "status": "affected", "version": "0", "versionType": "custom"}]}, {"product": "macOS", "vendor": "Apple", "versions": [{"lessThan": "26.1", "status": "affected", "version": "0", "versionType": "custom"}]}, {"product": "visionOS", "vendor": "Apple", "versions": [{"lessThan": "26.1", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "product-security@apple.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*", "matchCriteriaId": "CFF118CE-3F13-43BE-B250-5579E1C842EB", "versionEndExcluding": "26.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "matchCriteriaId": "6D51AEDC-9086-4010-B3BF-C652D65D09C8", "versionEndExcluding": "26.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "matchCriteriaId": "3981A7BE-BC98-4C6F-AE38-D68839368925", "versionEndExcluding": "26.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*", "matchCriteriaId": "7DFD3616-65CA-4E5C-849C-3C20ACBCB610", "versionEndExcluding": "26.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Multiple issues were addressed by disabling array allocation sinking. This issue is fixed in Safari 26.1, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected process crash."}, {"lang": "es", "value": "Se abordaron m\u00faltiples problemas al deshabilitar el hundimiento de asignaci\u00f3n de arreglos. Este problema est\u00e1 corregido en iOS 26.1 y iPadOS 26.1, Safari 26.1, visionOS 26.1. El procesamiento de contenido web malintencionado puede provocar una ca\u00edda inesperada del proceso."}], "id": "CVE-2025-43421", "lastModified": "2026-10-18T21:10:00.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-43421", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-11-04T13:09:19.765196Z", "version": "2.0.3"}}]}, "published": "2025-11-04T02:15:47.977", "references": [{"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125632"}, {"source": "product-security@apple.com", "url": "https://support.apple.com/en-us/125634"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125638"}, {"source": "product-security@apple.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://support.apple.com/en-us/125640"}], "sourceIdentifier": "product-security@apple.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash", "id": "2416355", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2416355"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["Multiple issues were addressed by disabling array allocation sinking. This issue is fixed in iOS 26.1 and iPadOS 26.1, Safari 26.1, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected process crash."], "name": "CVE-2025-43421", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "webkitgtk", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "webkitgtk3", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "webkitgtk4", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "webkit2gtk3", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "webkit2gtk3", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-11-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-43421\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-43421"], "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-27T23:14:05.727025+00:00", "value": {"mitigation_remediation": ["Upgrade Apple Safari, iOS, iPadOS, macOS, and visionOS to version\u00a026.1 or newer, which contains the WebKitGTK patch that disables array allocation sinking", "If immediate upgrade is not possible, isolate the affected browsing process by restricting exposure to untrusted web content or running the browser in a dedicated sandbox and monitor for crashes", "Apply the latest security updates to the underlying operating system and associated runtime libraries to ensure any related upstream fixes are in place"], "summary": {"action": "Update", "impact": "Denial of Service via process crash"}, "threat_synthesis": {"affected_systems": "Apple Safari on macOS and visionOS, and the Safari components embedded in iOS and iPadOS installations are impacted. All supported releases prior to version\u00a026.1 are vulnerable; the fix is incorporated in Safari\u00a026.1, iOS\u00a026.1, iPadOS\u00a026.1, macOS\u00a0Tahoe\u00a026.1, and visionOS\u00a026.1.", "description_and_impact": "This issue involves an out\u2011of\u2011bounds memory access and buffer over\u2011read during the parsing of maliciously crafted web content, as indicated by the CWE\u2011125 and CWE\u2011787 identifiers. Processing such content can cause the WebKitGTK\u2011based browser to crash unexpectedly, resulting in a denial of service to the user or for web\u2011based applications that rely on the affected rendering engine. The vulnerability does not provide any known mechanism for code execution or data exfiltration, but it can be leveraged to disrupt user experience or impair automated processes that depend on consistent browser operation.", "risk_and_exploitability": "The CVSS score of 4.3 reflects a moderate risk with a low likelihood of exploitation, which is further supported by an EPSS score of less than 1\u202f% and the vulnerability not being listed in the CISA KEV catalog. Attackers would need to supply malicious web content that reaches the vulnerable WebKitGTK engine, typically through a web page or embedded content; the effect is limited to a crash of the browser process with no known path to privilege escalation or remote code execution."}}}}, "created": "2025-11-04T16:34:24.507550+00:00", "updated": "2026-04-27T23:15:06.056170+00:00", "vendors": ["apple", "apple$PRODUCT$ios", "apple$PRODUCT$ipados", "apple$PRODUCT$safari", "apple$PRODUCT$visionos"]}