{"id":"CVE-2026-113903","kind":"vulnerability","aliases":["CVE-2026-113903"],"related":[],"title":"Safari and Apple OSes: use-after-free lets crafted web content modify memory","description":"A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 27.2, iOS 27.2 and iPadOS 27.2, macOS Golden Gate 27.2, visionOS 27.2. Processing maliciously crafted web content may lead to unexpected memory modification.","summary":"A use-after-free bug in WebKit-based Safari and Apple operating systems can be triggered by maliciously crafted web content. A successful attack may lead to unexpected modification of memory in the browser.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ios","ipados","macos","other","safari","visionos","webkit"],"not_affected_if":["already-updated-to-27.2"],"how_to_check":"- Check the Safari version on macOS or iOS and compare it with the fixed release `27.2` or later\n- Check the iOS, iPadOS, macOS or visionOS version in Settings > General > About and compare it with `27.2` or later\n- unknown for any further detail the sources do not give","fix":"- Update Safari to `27.2` or later\n- Update iOS and iPadOS to `27.2` or later\n- Update macOS (listed as Golden Gate) and visionOS to `27.2` or later","status":"open","published_at":"2026-10-26T21:18:07+00:00","first_seen_at":"2026-10-26T21:20:30+00:00","triaged_at":"2026-10-26T21:22:02+00:00","updated_at":"2026-10-26T21:22:02+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-26T21:22:02Z","model":"claude-haiku-5-5","output":{"fix":"- Update Safari to `27.2` or later\n- Update iOS and iPadOS to `27.2` or later\n- Update macOS (listed as Golden Gate) and visionOS to `27.2` or later","reach":"internet","title":"Safari and Apple OSes: use-after-free lets crafted web content modify memory","impact":"high","summary":"A use-after-free bug in WebKit-based Safari and Apple operating systems can be triggered by maliciously crafted web content. A successful attack may lead to unexpected modification of memory in the browser.","category":"other","nicknames":[],"who_cares":["safari","ios","ipados","macos","visionos","webkit"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker modifies process memory via crafted web page, possibly running code","analyst_note":"Check Apple's security release notes for CVE-2026-113903 to confirm the exploit impact and whether it is exploited in the wild.","how_to_check":"- Check the Safari version on macOS or iOS and compare it with the fixed release `27.2` or later\n- Check the iOS, iPadOS, macOS or visionOS version in Settings > General > About and compare it with `27.2` or later\n- unknown for any further detail the sources do not give","needs_analyst":true,"not_affected_if":["already-updated-to-27.2"],"who_is_affected":"Anyone browsing with Safari or a WebKit-based app on the listed Apple platforms before the fixed release. Browsing only trusted sites does not remove the exposure, since the trigger is web content. Managed fleets of Apple devices should be checked against the fixed versions.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000629,"input_tokens":3292,"output_tokens":599,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-113903':17A,20A '-2026':16A,19A '27.2':82C,84C,87C,91C,93C 'address':71C 'appl':3A,40B 'attack':53B 'base':37B 'browser':63B 'bug':33B 'content':12A,50B,98C 'craft':10A,48B,96C 'cve':15A,18A 'fix':79C 'free':8A,32B,68C 'gate':90C 'golden':89C 'improv':73C 'io':21B,83C 'ipado':22B,86C 'issu':69C,77C 'lead':55B,100C 'let':9A 'maco':23B,88C 'malici':47B,95C 'manag':75C 'may':54B,99C 'memori':14A,60B,74C,103C 'modif':58B,104C 'modifi':13A 'oper':41B 'ose':4A 'process':94C 'safari':1A,25B,38B,81C 'success':52B 'system':42B 'trigger':45B 'unexpect':57B,102C 'use':6A,30B,66C 'use-after-fre':5A,29B,65C 'visiono':26B,92C 'web':11A,49B,97C 'webkit':27B,36B 'webkit-bas':35B","nicknames":[],"mitigations":[],"who_affected":"Anyone browsing with Safari or a WebKit-based app on the listed Apple platforms before the fixed release. Browsing only trusted sites does not remove the exposure, since the trigger is web content. Managed fleets of Apple devices should be checked against the fixed versions.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T21:18:07+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-113903","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113903","severity":null,"published_at":"2026-10-26T21:18:07+00:00","modified_at":"2026-10-26T21:18:07+00:00","first_seen_at":"2026-10-26T21:20:30+00:00","fetched_at":"2026-10-26T21:20:30+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}