{"id":"CVE-2026-117918","kind":"vulnerability","aliases":["CVE-2026-117918"],"related":[],"title":"Firefox: use-after-free in Canvas2D graphics component fixed in releases","description":"Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.","summary":"A use-after-free bug in Firefox's Canvas2D graphics component can corrupt memory when a page draws on a canvas. The sources do not say what an attacker can achieve beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Check the installed Firefox version, for example by opening `about:support` and reading the Application Basics section.\n- Compare it with the fixed versions: Firefox 159, Firefox ESR 115.44, or Firefox ESR 153.6.","fix":"- Update Firefox to 159 or later.\n- Update Firefox ESR to `115.44` or `153.6` or later, depending on the ESR branch in use.","status":"open","published_at":"2026-10-27T14:16:47+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","triaged_at":"2026-10-27T14:37:19+00:00","updated_at":"2026-10-27T14:37:19+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:37:19Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to 159 or later.\n- Update Firefox ESR to `115.44` or `153.6` or later, depending on the ESR branch in use.","reach":"unknown","title":"Firefox: use-after-free in Canvas2D graphics component fixed in releases","impact":"medium","summary":"A use-after-free bug in Firefox's Canvas2D graphics component can corrupt memory when a page draws on a canvas. The sources do not say what an attacker can achieve beyond that.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.5,"needs_auth":"unknown","worst_case":"unknown","analyst_note":"Check the Mozilla Foundation security advisory for this CVE to confirm trigger conditions, impact, and whether it is exploitable from web content.","how_to_check":"- Check the installed Firefox version, for example by opening `about:support` and reading the Application Basics section.\n- Compare it with the fixed versions: Firefox 159, Firefox ESR 115.44, or Firefox ESR 153.6.","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running a Firefox build older than the fixed releases on a desktop or in a managed fleet. The sources do not say whether web content alone can trigger the flaw or whether special settings are needed.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000588,"input_tokens":3256,"output_tokens":524,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117918':15A,18A '-2026':14A,17A '115.44':74C '153.6':78C '159':71C 'achiev':54B 'attack':52B 'beyond':55B 'browser':19B 'bug':28B 'canva':44B 'canvas2d':7A,32B,63C 'compon':9A,34B,64C 'corrupt':36B 'cve':13A,16A 'desktop':20B 'draw':41B 'esr':73C,77C 'firefox':1A,21B,30B,70C,72C,76C 'fix':10A,68C 'free':5A,27B,59C 'graphic':8A,33B,62C 'memori':37B 'page':40B 'releas':12A 'runtim':22B 'say':49B 'sourc':46B 'use':3A,25B,57C 'use-after-fre':2A,24B,56C 'vulner':66C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than the fixed releases on a desktop or in a managed fleet. The sources do not say whether web content alone can trigger the flaw or whether special settings are needed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:47+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117918","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117918","severity":null,"published_at":"2026-10-27T14:16:47+00:00","modified_at":"2026-10-27T14:16:47+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","fetched_at":"2026-10-27T14:32:22+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"}