{"id":"CVE-2026-117948","kind":"vulnerability","aliases":["CVE-2026-117948"],"related":[],"title":"Firefox: use-after-free in SVG component can crash or run code","description":"Use-after-free in the SVG 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 SVG handling lets a malicious page reuse freed memory. Depending on the attacker's control over that memory, this can crash the browser or let an attacker run code in it.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","other"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Run `firefox --version` (or check Help > About) and compare against `159` for Firefox or `115.44` / `153.6` for ESR.\n- On managed fleets, check the installed Firefox version in your endpoint management tool.","fix":"- Update Firefox to `159` or later.\n- Update Firefox ESR to `115.44` or `153.6`, or later in the same branch.","status":"open","published_at":"2026-10-27T14:16:50+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","triaged_at":"2026-10-27T14:35:40+00:00","updated_at":"2026-10-27T14:35:40+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-27T14:35:40Z","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 in the same branch.","reach":"internet","title":"Firefox: use-after-free in SVG component can crash or run code","impact":"high","summary":"A use-after-free bug in Firefox's SVG handling lets a malicious page reuse freed memory. Depending on the attacker's control over that memory, this can crash the browser or let an attacker run code in it.","category":"other","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code inside the browser after a visit","analyst_note":"Check the Mozilla security advisory for this CVE to confirm exploitability, user interaction requirement, and whether the bug was used in the wild.","how_to_check":"- Run `firefox --version` (or check Help > About) and compare against `159` for Firefox or `115.44` / `153.6` for ESR.\n- On managed fleets, check the installed Firefox version in your endpoint management tool.","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop users who open untrusted web content. Servers and applications that do not run a browser are not affected by this flaw. The sources do not say whether the bug is reachable without user interaction.","user_interaction":"unknown","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000594,"input_tokens":3240,"output_tokens":540,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117948':16A,19A '-2026':15A,18A '115.44':78C '153.6':82C '159':75C 'attack':44B,58B 'browser':20B,54B 'bug':28B 'code':13A,60B 'compon':8A,68C 'control':46B 'crash':10A,52B 'cve':14A,17A 'depend':41B 'desktop':21B 'esr':77C,81C 'firefox':1A,22B,30B,74C,76C,80C 'fix':72C 'free':5A,27B,64C 'freed':39B 'handl':33B 'let':34B,56B 'malici':36B 'memori':40B,49B 'page':37B 'reus':38B 'run':12A,59B 'svg':7A,32B,67C 'use':3A,25B,62C 'use-after-fre':2A,24B,61C 'vulner':70C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop users who open untrusted web content. Servers and applications that do not run a browser are not affected by this flaw. The sources do not say whether the bug is reachable without user interaction.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:50+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117948","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117948","severity":null,"published_at":"2026-10-27T14:16:50+00:00","modified_at":"2026-10-27T14:16:50+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","fetched_at":"2026-10-27T14:32:23+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"}