{"id":"CVE-2026-124922","kind":"vulnerability","aliases":["CVE-2026-124922"],"related":[],"title":"Firefox: use-after-free in CSS animations can crash or run code","description":"Use-after-free in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A use-after-free bug in Firefox's CSS Transitions and Animations component lets a web page corrupt memory the browser has already released. The sources do not state what an attacker can achieve beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser-users","firefox","runtime"],"not_affected_if":["up-to-date-firefox"],"how_to_check":"- Check the installed Firefox version in the About Firefox menu; the sources name Firefox 160 and Firefox ESR 153.7 as the fixed releases.\n- Compare the version against `160` for standard Firefox and `153.7` for Firefox ESR.","fix":"- Firefox `160` and Firefox ESR `153.7` contain the fix.","status":"open","published_at":"2026-11-10T14:17:26+00:00","first_seen_at":"2026-11-10T14:22:18+00:00","triaged_at":"2026-11-10T14:24:27+00:00","updated_at":"2026-11-10T14:24:27+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:24:27Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160` and Firefox ESR `153.7` contain the fix.","reach":"internet","title":"Firefox: use-after-free in CSS animations can crash or run code","impact":"high","summary":"A use-after-free bug in Firefox's CSS Transitions and Animations component lets a web page corrupt memory the browser has already released. The sources do not state what an attacker can achieve beyond that.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browser-users"],"confidence":0.5,"fix_status":"available","needs_auth":"no","worst_case":"unknown; memory corruption in the browser, exact impact not stated","analyst_note":"Check the Mozilla security advisory and the NVD entry for the exploitation impact and the CVSS score.","how_to_check":"- Check the installed Firefox version in the About Firefox menu; the sources name Firefox 160 and Firefox ESR 153.7 as the fixed releases.\n- Compare the version against `160` for standard Firefox and `153.7` for Firefox ESR.","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7, or later, from the Firefox menu's About Firefox section.","product_name":"","needs_analyst":true,"not_affected_if":["up-to-date-firefox"],"who_is_affected":"Anyone running a Firefox build older than 160 or ESR older than 153.7 is exposed when they open web pages. Users on a current release are not affected. The sources do not say whether the flaw is reachable without user interaction.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000735,"input_tokens":4480,"output_tokens":573,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124922':16A,19A '-2026':15A,18A '153.7':82C '160':78C 'achiev':59B 'alreadi':48B 'anim':8A,37B,70C 'attack':57B 'beyond':60B 'browser':21B,46B 'browser-us':20B 'bug':30B 'code':13A 'compon':38B,71C 'corrupt':43B 'crash':10A 'css':7A,34B,67C 'cve':14A,17A 'esr':81C 'firefox':1A,23B,32B,77C,80C 'fix':75C 'free':5A,29B,64C 'let':39B 'memori':44B 'page':42B 'releas':49B 'run':12A 'runtim':24B 'sourc':51B 'state':54B 'transit':35B,68C 'use':3A,27B,62C 'use-after-fre':2A,26B,61C 'user':22B 'vulner':73C 'web':41B","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than 160 or ESR older than 153.7 is exposed when they open web pages. Users on a current release are not affected. The sources do not say whether the flaw is reachable without user interaction.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7, or later, from the Firefox menu's About Firefox section.","pkeys":[],"ptokens":[],"labels":["browserusers","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124922':16A,19A '-2026':15A,18A 'anim':8A 'code':13A 'crash':10A 'css':7A 'cve':14A,17A 'firefox':1A 'free':5A 'run':12A 'use':3A 'use-after-fre':2A","search_b":"'achiev':59B 'alreadi':48B 'anim':37B 'attack':57B 'beyond':60B 'browser':21B,46B 'browser-us':20B 'bug':30B 'compon':38B 'corrupt':43B 'css':34B 'firefox':23B,32B 'free':29B 'let':39B 'memori':44B 'page':42B 'releas':49B 'runtim':24B 'sourc':51B 'state':54B 'transit':35B 'use':27B 'use-after-fre':26B 'user':22B 'web':41B","search_c":"'153.7':82C '160':78C 'anim':70C 'compon':71C 'css':67C 'esr':81C 'firefox':77C,80C 'fix':75C 'free':64C 'transit':68C 'use':62C 'use-after-fre':61C 'vulner':73C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:26+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124922","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124922","severity":null,"published_at":"2026-11-10T14:17:26+00:00","modified_at":"2026-11-10T14:17:26+00:00","first_seen_at":"2026-11-10T14:22:18+00:00","fetched_at":"2026-11-10T14:22:18+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}