{"id":"CVE-2026-128018","kind":"vulnerability","aliases":["CVE-2026-128018"],"related":[],"title":"FrankenPHP: fatal startup error in worker mode leaves requests hanging forever","description":"FrankenPHP before 1.13.4 contains a denial of service vulnerability in worker mode where frankenphp_handle_request() returns false without finishing the dequeued request after a fatal error during request startup. Attackers who trigger startup fatal errors against worker scripts that keep calling frankenphp_handle_request() can leave client requests hanging indefinitely while the worker continues running.","summary":"FrankenPHP before 1.13.4 can leave a client request unfinished when a worker script hits a fatal error during request startup, because frankenphp_handle_request() returns false without completing the dequeued request. An attacker who triggers those startup fatals can make client requests hang indefinitely while the worker keeps running.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["frankenphp","php","runtime","self-hosted","worker-mode"],"not_affected_if":["default-config","no-worker-mode"],"how_to_check":"- Check the FrankenPHP version in use, for example with `frankenphp version`.\n- Look for worker mode in the Caddyfile or config, for example `php_server` with a `worker` directive.","fix":"- FrankenPHP: move to `1.13.4` or later.","status":"open","published_at":"2026-11-13T10:18:07+00:00","first_seen_at":"2026-11-13T10:47:30+00:00","triaged_at":"2026-11-13T10:55:15+00:00","updated_at":"2026-11-13T10:55:15+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-13T10:55:15Z","model":"claude-haiku-5-5","output":{"fix":"- FrankenPHP: move to `1.13.4` or later.","reach":"internet","title":"FrankenPHP: fatal startup error in worker mode leaves requests hanging forever","impact":"low","summary":"FrankenPHP before 1.13.4 can leave a client request unfinished when a worker script hits a fatal error during request startup, because frankenphp_handle_request() returns false without completing the dequeued request. An attacker who triggers those startup fatals can make client requests hang indefinitely while the worker keeps running.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["frankenphp","php","worker-mode","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"unknown","worst_case":"client requests hang indefinitely, worker stays running","analyst_note":"","how_to_check":"- Check the FrankenPHP version in use, for example with `frankenphp version`.\n- Look for worker mode in the Caddyfile or config, for example `php_server` with a `worker` directive.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["default-config","no-worker-mode"],"who_is_affected":"Applications running FrankenPHP in worker mode, where a long-lived PHP worker script calls frankenphp_handle_request() repeatedly. Servers that run FrankenPHP without worker mode, or that do not run FrankenPHP at all, are not affected by this description.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000732,"input_tokens":4640,"output_tokens":536,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-128018':14A,17A '-2026':13A,16A '1.13.4':29B,78C 'attack':59B,106C 'call':117C 'client':33B,67B,123C 'complet':54B 'contain':79C 'continu':130C 'cve':12A,15A 'denial':81C 'dequeu':56B,97C 'error':4A,43B,102C,111C 'fals':52B,93C 'fatal':2A,42B,64B,101C,110C 'finish':95C 'forev':11A 'frankenphp':1A,18B,27B,48B,76C,89C,118C 'handl':49B,90C,119C 'hang':10A,69B,125C 'hit':40B 'host':23B 'indefinit':70B,126C 'keep':74B,116C 'leav':8A,31B,122C 'make':66B 'mode':7A,26B,87C 'php':19B 'request':9A,34B,45B,50B,57B,68B,91C,98C,104C,120C,124C 'return':51B,92C 'run':75B,131C 'runtim':20B 'script':39B,114C 'self':22B 'self-host':21B 'servic':83C 'startup':3A,46B,63B,105C,109C 'trigger':61B,108C 'unfinish':35B 'vulner':84C 'without':53B,94C 'worker':6A,25B,38B,73B,86C,113C,129C 'worker-mod':24B","nicknames":[],"mitigations":[],"who_affected":"Applications running FrankenPHP in worker mode, where a long-lived PHP worker script calls frankenphp_handle_request() repeatedly. Servers that run FrankenPHP without worker mode, or that do not run FrankenPHP at all, are not affected by this description.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["frankenphp","medium","php","runtime","selfhosted","workermode"],"campaign_type":null,"search_a":"'-128018':14A,17A '-2026':13A,16A 'cve':12A,15A 'error':4A 'fatal':2A 'forev':11A 'frankenphp':1A 'hang':10A 'leav':8A 'mode':7A 'request':9A 'startup':3A 'worker':6A","search_b":"'1.13.4':29B 'attack':59B 'client':33B,67B 'complet':54B 'dequeu':56B 'error':43B 'fals':52B 'fatal':42B,64B 'frankenphp':18B,27B,48B 'handl':49B 'hang':69B 'hit':40B 'host':23B 'indefinit':70B 'keep':74B 'leav':31B 'make':66B 'mode':26B 'php':19B 'request':34B,45B,50B,57B,68B 'return':51B 'run':75B 'runtim':20B 'script':39B 'self':22B 'self-host':21B 'startup':46B,63B 'trigger':61B 'unfinish':35B 'without':53B 'worker':25B,38B,73B 'worker-mod':24B","search_c":"'1.13.4':78C 'attack':106C 'call':117C 'client':123C 'contain':79C 'continu':130C 'denial':81C 'dequeu':97C 'error':102C,111C 'fals':93C 'fatal':101C,110C 'finish':95C 'frankenphp':76C,89C,118C 'handl':90C,119C 'hang':125C 'indefinit':126C 'keep':116C 'leav':122C 'mode':87C 'request':91C,98C,104C,120C,124C 'return':92C 'run':131C 'script':114C 'servic':83C 'startup':105C,109C 'trigger':108C 'vulner':84C 'without':94C 'worker':86C,113C,129C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-26T16:53:47+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-128018","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128018","severity":null,"published_at":"2026-11-13T10:18:07+00:00","modified_at":"2026-11-13T10:18:07+00:00","first_seen_at":"2026-11-13T10:47:30+00:00","fetched_at":"2026-11-13T10:47:30+00:00","note":null}],"documents":[{"id":145334,"url":"https://github.com/php/frankenphp/commit/185bfe578af854d29d7bdff3dd83b3b9dea3572b","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":145335,"url":"https://github.com/php/frankenphp/security/advisories/GHSA-x6j6-qv7w-fq3c","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-26T16:53:47+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":145336,"url":"https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-pending-worker-request-denial-of-service","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"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}