{"id":"CVE-2026-116463","kind":"vulnerability","aliases":["CVE-2026-116463"],"related":[],"title":"FastStone Image Viewer: out-of-bounds read in image downsampler, remote trigger","description":"A vulnerability was identified in FastStone Image Viewer up to 8.5. Affected is the function FUN_0062d96c of the component Box-Average Downsampler Engine. The manipulation leads to out-of-bounds read. It is possible to initiate the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.","summary":"FastStone Image Viewer up to version 8.5 has an out-of-bounds read in its Box-Average Downsampler component, reached through function FUN_0062d96c. The sources say an attacker can trigger it remotely by manipulating the input, which may leak memory contents.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["faststone-image-viewer","other","windows"],"not_affected_if":["unknown"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-26T18:17:45+00:00","first_seen_at":"2026-10-26T18:31:44+00:00","triaged_at":"2026-10-26T18:33:49+00:00","updated_at":"2026-10-26T18:33:49+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-10-26T18:33:49Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"unknown","title":"FastStone Image Viewer: out-of-bounds read in image downsampler, remote trigger","impact":"low","summary":"FastStone Image Viewer up to version 8.5 has an out-of-bounds read in its Box-Average Downsampler component, reached through function FUN_0062d96c. The sources say an attacker can trigger it remotely by manipulating the input, which may leak memory contents.","category":"other","nicknames":[],"who_cares":["windows","faststone-image-viewer"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Attacker reads adjacent process memory via crafted image input.","analyst_note":"Check NVD and vendor or distributor pages for the fixed version and whether user interaction (opening a crafted image) is required; the sources give no remediation.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organisations that run FastStone Image Viewer version 8.5 or earlier on machines where it opens images from untrusted sources. The sources do not describe a server-side deployment or a default configuration that makes it more exposed. The vendor did not respond to disclosure, so no patch is confirmed.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000567,"input_tokens":3320,"output_tokens":470,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-116463':16A,19A '-2026':15A,18A '0062d96c':51B,86C '8.5':32B,80C 'affect':81C 'attack':56B,110C 'averag':44B,92C 'bound':7A,38B,102C 'box':43B,91C 'box-averag':42B,90C 'compon':46B,89C 'contact':115C 'content':69B 'cve':14A,17A 'disclosur':119C 'downsampl':11A,45B,93C 'earli':116C 'engin':94C 'fastston':1A,21B,26B,75C 'faststone-image-view':20B 'fun':50B,85C 'function':49B,84C 'identifi':73C 'imag':2A,10A,22B,27B,76C 'initi':108C 'input':64B 'lead':97C 'leak':67B 'manipul':62B,96C 'may':66B 'memori':68B 'out-of-bound':4A,35B,99C 'possibl':106C 'reach':47B 'read':8A,39B,103C 'remot':12A,60B,111C 'respond':123C 'say':54B 'sourc':53B 'trigger':13A,58B 'vendor':113C 'version':31B 'viewer':3A,23B,28B,77C 'vulner':71C 'way':126C 'window':25B","nicknames":[],"mitigations":[],"who_affected":"Organisations that run FastStone Image Viewer version 8.5 or earlier on machines where it opens images from untrusted sources. The sources do not describe a server-side deployment or a default configuration that makes it more exposed. The vendor did not respond to disclosure, so no patch is confirmed.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T18:17:45+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"cna@vuldb.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116463","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116463","severity":null,"published_at":"2026-10-26T18:17:45+00:00","modified_at":"2026-10-26T18:17:45+00:00","first_seen_at":"2026-10-26T18:31:44+00:00","fetched_at":"2026-10-26T18:31:44+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"}