{"id":"CVE-2026-123616","kind":"vulnerability","aliases":["CVE-2026-123616"],"related":[],"title":"imgproxy: crafted ICO file exhausts memory and crashes workers","description":"imgproxy from 3.3.0 before 4.0.16 contains an unbounded memory allocation vulnerability in the ICO loader that fails to validate the data_size field. Attackers can supply a crafted 23-byte ICO file declaring a ~4GB data_size to trigger memory exhaustion and worker crashes without authentication.","summary":"imgproxy, an image processing server, fails to validate the data_size field in its ICO image loader. A crafted 23-byte ICO file declaring about 4GB of data can exhaust memory and crash worker processes.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["image-processing","imgproxy","runtime","self-hosted"],"not_affected_if":["version-4.0.16-or-later"],"how_to_check":"- Check the imgproxy version the server runs, for example with `imgproxy -v` or the container image tag.\n- Confirm whether the instance accepts remote image URLs from outside your network.","fix":"- imgproxy from `3.3.0` before `4.0.16`: move to `4.0.16` or later.","status":"open","published_at":"2026-11-08T02:16:57+00:00","first_seen_at":"2026-11-08T02:21:14+00:00","triaged_at":"2026-11-08T02:22:42+00:00","updated_at":"2026-11-08T02:22:42+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-08T02:22:42Z","model":"claude-haiku-5-5","output":{"fix":"- imgproxy from `3.3.0` before `4.0.16`: move to `4.0.16` or later.","reach":"internet","title":"imgproxy: crafted ICO file exhausts memory and crashes workers","impact":"medium","summary":"imgproxy, an image processing server, fails to validate the data_size field in its ICO image loader. A crafted 23-byte ICO file declaring about 4GB of data can exhaust memory and crash worker processes.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["imgproxy","self-hosted","image-processing"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Memory exhaustion and worker crashes; service becomes unavailable","analyst_note":"","how_to_check":"- Check the imgproxy version the server runs, for example with `imgproxy -v` or the container image tag.\n- Confirm whether the instance accepts remote image URLs from outside your network.","plain_action":"","needs_analyst":false,"not_affected_if":["version-4.0.16-or-later"],"who_is_affected":"Any imgproxy deployment from 3.3.0 before 4.0.16 that processes ICO images is exposed; the sources describe no authentication requirement. Teams that run imgproxy only on fully trusted inputs or on a version at or above 4.0.16 can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000686,"input_tokens":4288,"output_tokens":514,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123616':12A,15A '-2026':11A,14A '23':43B,87C '3.3.0':61C '4.0.16':63C '4gb':49B,93C 'alloc':68C 'attack':82C 'authent':104C 'byte':44B,88C 'contain':64C 'craft':2A,42B,86C 'crash':8A,56B,102C 'cve':10A,13A 'data':33B,51B,79C,94C 'declar':47B,91C 'exhaust':5A,53B,99C 'fail':29B,75C 'field':35B,81C 'file':4A,46B,90C 'host':23B 'ico':3A,38B,45B,72C,89C 'imag':17B,26B,39B 'image-process':16B 'imgproxi':1A,19B,24B,59C 'loader':40B,73C 'memori':6A,54B,67C,98C 'process':18B,27B,58B 'runtim':20B 'self':22B 'self-host':21B 'server':28B 'size':34B,80C,95C 'suppli':84C 'trigger':97C 'unbound':66C 'valid':31B,77C 'vulner':69C 'without':103C 'worker':9A,57B,101C","nicknames":[],"mitigations":[],"who_affected":"Any imgproxy deployment from 3.3.0 before 4.0.16 that processes ICO images is exposed; the sources describe no authentication requirement. Teams that run imgproxy only on fully trusted inputs or on a version at or above 4.0.16 can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","imageprocessing","imgproxy","runtime","selfhosted"],"campaign_type":null,"search_a":"'-123616':12A,15A '-2026':11A,14A 'craft':2A 'crash':8A 'cve':10A,13A 'exhaust':5A 'file':4A 'ico':3A 'imgproxi':1A 'memori':6A 'worker':9A","search_b":"'23':43B '4gb':49B 'byte':44B 'craft':42B 'crash':56B 'data':33B,51B 'declar':47B 'exhaust':53B 'fail':29B 'field':35B 'file':46B 'host':23B 'ico':38B,45B 'imag':17B,26B,39B 'image-process':16B 'imgproxi':19B,24B 'loader':40B 'memori':54B 'process':18B,27B,58B 'runtim':20B 'self':22B 'self-host':21B 'server':28B 'size':34B 'valid':31B 'worker':57B","search_c":"'23':87C '3.3.0':61C '4.0.16':63C '4gb':93C 'alloc':68C 'attack':82C 'authent':104C 'byte':88C 'contain':64C 'craft':86C 'crash':102C 'data':79C,94C 'declar':91C 'exhaust':99C 'fail':75C 'field':81C 'file':90C 'ico':72C,89C 'imgproxi':59C 'loader':73C 'memori':67C,98C 'size':80C,95C 'suppli':84C 'trigger':97C 'unbound':66C 'valid':77C 'vulner':69C 'without':103C 'worker':101C","first_public_at":"2026-10-06T15:28:16+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123616","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123616","severity":null,"published_at":"2026-11-08T02:16:57+00:00","modified_at":"2026-11-08T02:16:57+00:00","first_seen_at":"2026-11-08T02:21:14+00:00","fetched_at":"2026-11-08T02:21:14+00:00","note":null}],"documents":[{"id":26519,"url":"https://github.com/imgproxy/imgproxy/security/advisories/GHSA-mmq5-xm89-9pfg","title":"Maintainer's advisory: github.com","kind":"vendor","source":"ghsa","publisher":"vendor","text":null,"published_at":"2026-10-06T15:28:16+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99385,"url":"https://www.vulncheck.com/advisories/imgproxy-3.3.0-before-4.0.16-memory-exhaustion-dos-via-ico-loader","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}