{"id":"CVE-2026-112421","kind":"vulnerability","aliases":["CVE-2026-112421"],"related":[],"title":"macOS: symlink race lets an app modify protected file system parts","description":"A race condition was addressed with improved handling of symbolic links. This issue is fixed in macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. An app may be able to modify protected parts of the file system.","summary":"A race condition in how macOS handles symbolic links lets an app change protected parts of the file system. Apple fixed it in macOS Golden Gate 27.2, Sequoia 15.8.2 and Tahoe 26.7.2.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["endpoints","infrastructure","macos"],"not_affected_if":[],"how_to_check":"- Run `sw_vers -productVersion` on each Mac and compare against the fixed versions\n- unknown","fix":"- Update macOS to `27.2` (Golden Gate), `15.8.2` (Sequoia) or `26.7.2` (Tahoe)\n- unknown","status":"open","published_at":"2026-10-26T21:17:31+00:00","first_seen_at":"2026-10-26T21:20:25+00:00","triaged_at":"2026-10-26T21:31:49+00:00","updated_at":"2026-10-26T21:31:49+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-26T21:31:49Z","model":"claude-haiku-5-5","output":{"fix":"- Update macOS to `27.2` (Golden Gate), `15.8.2` (Sequoia) or `26.7.2` (Tahoe)\n- unknown","reach":"local","title":"macOS: symlink race lets an app modify protected file system parts","impact":"high","summary":"A race condition in how macOS handles symbolic links lets an app change protected parts of the file system. Apple fixed it in macOS Golden Gate 27.2, Sequoia 15.8.2 and Tahoe 26.7.2.","category":"infrastructure","nicknames":[],"who_cares":["macos","endpoints"],"confidence":0.5,"needs_auth":"unknown","worst_case":"A local app modifies protected system files on the Mac.","analyst_note":"Check Apple's security release notes for this CVE to confirm the attack preconditions and whether it is exploited.","how_to_check":"- Run `sw_vers -productVersion` on each Mac and compare against the fixed versions\n- unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Any Mac running a macOS release older than the fixed versions named in the advisory. The sources do not say which local app conditions are needed to trigger the race, so teams cannot skip it on that basis. unknown for the exact preconditions.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000571,"input_tokens":3280,"output_tokens":486,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-112421':14A,17A '-2026':13A,16A '15.8.2':49B,75C '26.7.2':52B,78C '27.2':47B,72C 'abl':83C 'address':57C 'app':6A,32B,80C 'appl':40B 'chang':33B 'condit':23B,55C 'cve':12A,15A 'endpoint':18B 'file':9A,38B,90C 'fix':41B,67C 'gate':46B,71C 'golden':45B,70C 'handl':27B,60C 'improv':59C 'infrastructur':19B 'issu':65C 'let':4A,30B 'link':29B,63C 'maco':1A,20B,26B,44B,69C,73C,76C 'may':81C 'modifi':7A,85C 'part':11A,35B,87C 'protect':8A,34B,86C 'race':3A,22B,54C 'sequoia':48B,74C 'symbol':28B,62C 'symlink':2A 'system':10A,39B,91C 'taho':51B,77C","nicknames":[],"mitigations":[],"who_affected":"Any Mac running a macOS release older than the fixed versions named in the advisory. The sources do not say which local app conditions are needed to trigger the race, so teams cannot skip it on that basis. unknown for the exact preconditions.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T21:17:31+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112421","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112421","severity":null,"published_at":"2026-10-26T21:17:31+00:00","modified_at":"2026-10-26T21:17:31+00:00","first_seen_at":"2026-10-26T21:20:25+00:00","fetched_at":"2026-10-26T21:20:25+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"}