{"id":"CVE-2026-50787","kind":"vulnerability","aliases":["CVE-2026-50787"],"related":[],"title":"e-SIC Livre: CAPTCHA endpoint lets remote users exhaust server memory and CPU","description":"e-SIC Livre (esiclivre) v0.2.2 and earlier contains an uncontrolled resource consumption vulnerability in restrito/inc/captcha.php. The application uses user-supplied parameters (l, a, tf, ql) without validation to generate CAPTCHA images, allowing remote attackers to cause denial of service via excessive memory and CPU consumption.","summary":"e-SIC Livre v0.2.2 and earlier takes unchecked parameters (l, a, tf, ql) in restrito/inc/captcha.php to size CAPTCHA images. A remote attacker can send oversized values to make the server consume excessive memory and CPU, causing denial of service.","severity":"medium","cvss":null,"epss":0.0026,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["e-sic-livre","package","php","self-hosted"],"not_affected_if":["newer-version"],"how_to_check":"- Look for `restrito/inc/captcha.php` in the e-SIC Livre install and confirm the installed version with the project's version file\n- unknown","fix":"- unknown","status":"open","published_at":"2026-10-23T16:16:51+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","triaged_at":"2026-10-25T04:52:06+00:00","updated_at":"2026-10-25T12:38:49+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:52:06Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"internet","title":"e-SIC Livre: CAPTCHA endpoint lets remote users exhaust server memory and CPU","impact":"low","summary":"e-SIC Livre v0.2.2 and earlier takes unchecked parameters (l, a, tf, ql) in restrito/inc/captcha.php to size CAPTCHA images. A remote attacker can send oversized values to make the server consume excessive memory and CPU, causing denial of service.","category":"package","nicknames":[],"who_cares":["e-sic-livre","php","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Server resources exhausted, service becomes unavailable to users","analyst_note":"Check the NVD entry and the project repository for a patched version number and whether captcha.php is reachable without login.","how_to_check":"- Look for `restrito/inc/captcha.php` in the e-SIC Livre install and confirm the installed version with the project's version file\n- unknown","needs_analyst":true,"not_affected_if":["newer-version"],"who_is_affected":"Sites running e-SIC Livre v0.2.2 or earlier that expose the restrito/inc/captcha.php endpoint to the internet. The sources do not say whether a default install exposes it or whether authentication is required to reach it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000583,"input_tokens":3345,"output_tokens":496,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-50787':17A,20A 'allow':103C 'applic':87C 'attack':52B,105C 'captcha':5A,48B,101C 'caus':66B,107C 'consum':61B 'consumpt':82C,116C 'contain':78C 'cpu':14A,65B,115C 'cve':15A,18A 'denial':67B,108C 'e':2A,22B,31B,71C 'e-sic':1A,30B,70C 'e-sic-livr':21B 'earlier':36B,77C 'endpoint':6A 'esiclivr':74C 'excess':62B,112C 'exhaust':10A 'generat':100C 'host':29B 'imag':49B,102C 'l':40B,93C 'let':7A 'livr':4A,24B,33B,73C 'make':58B 'memori':12A,63B,113C 'overs':55B 'packag':25B 'paramet':39B,92C 'php':26B 'ql':43B,96C 'remot':8A,51B,104C 'resourc':81C 'restrito/inc/captcha.php':45B,85C 'self':28B 'self-host':27B 'send':54B 'server':11A,60B 'servic':69B,110C 'sic':3A,23B,32B,72C 'size':47B 'suppli':91C 'take':37B 'tf':42B,95C 'uncheck':38B 'uncontrol':80C 'use':88C 'user':9A,90C 'user-suppli':89C 'v0.2.2':34B,75C 'valid':98C 'valu':56B 'via':111C 'vulner':83C 'without':97C","nicknames":[],"mitigations":[],"who_affected":"Sites running e-SIC Livre v0.2.2 or earlier that expose the restrito/inc/captcha.php endpoint to the internet. The sources do not say whether a default install exposes it or whether authentication is required to reach it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T16:16:51+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-50787","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50787","severity":null,"published_at":"2026-10-23T16:16:51+00:00","modified_at":"2026-10-23T19:57:42+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"epss","external_id":"CVE-2026-50787","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-50787","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-25T12:38:49+00:00","fetched_at":"2026-10-25T12:38:49+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"}