{"id":"CVE-2026-128020","kind":"vulnerability","aliases":["CVE-2026-128020"],"related":[],"title":"FrankenPHP: circular PHP arrays crash the whole server process","description":"FrankenPHP before 1.13.2 contains an uncontrolled recursion vulnerability in its PHP-to-Go array converter that fails to detect circular references in PHP arrays. Passing a self-referential array to frankenphp_log() or returning one from a worker callback triggers a fatal Go stack overflow, terminating the entire server process.","summary":"FrankenPHP before 1.13.2 does not detect self-referential PHP arrays when converting them to Go values, so passing one to frankenphp_log() or returning one from a worker callback causes a fatal Go stack overflow. An attacker who can get such a request through terminates the entire server process, a denial of service.","severity":"high","cvss":8.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["frankenphp","go","php","runtime","self-hosted"],"not_affected_if":["no-worker-mode","patched-version"],"how_to_check":"- Check the FrankenPHP version with `frankenphp version` or the binary your server runs\n- Look for calls to `frankenphp_log()` and worker callbacks that return arrays built from user input","fix":"- FrankenPHP: `1.13.2`","status":"open","published_at":"2026-11-13T10:18:07+00:00","first_seen_at":"2026-11-13T10:47:30+00:00","triaged_at":"2026-11-13T10:51:23+00:00","updated_at":"2026-11-13T10:51:23+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-13T10:51:23Z","model":"claude-haiku-5-5","output":{"fix":"- FrankenPHP: `1.13.2`","reach":"internet","title":"FrankenPHP: circular PHP arrays crash the whole server process","impact":"low","summary":"FrankenPHP before 1.13.2 does not detect self-referential PHP arrays when converting them to Go values, so passing one to frankenphp_log() or returning one from a worker callback causes a fatal Go stack overflow. An attacker who can get such a request through terminates the entire server process, a denial of service.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["frankenphp","php","self-hosted","go"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"server process crashes, taking down all requests","analyst_note":"","how_to_check":"- Check the FrankenPHP version with `frankenphp version` or the binary your server runs\n- Look for calls to `frankenphp_log()` and worker callbacks that return arrays built from user input","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["patched-version","no-worker-mode"],"who_is_affected":"Any application running FrankenPHP before 1.13.2 that passes PHP arrays into frankenphp_log() or returns arrays from worker callbacks can be crashed by a request that produces a self-referential array. Applications on a patched version, or that never use these paths with array data, are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000723,"input_tokens":4615,"output_tokens":522,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-128020':12A,15A '-2026':11A,14A '1.13.2':25B,79C 'array':4A,33B,91C,101C,107C 'attack':60B 'callback':52B,117C 'caus':53B 'circular':2A,97C 'contain':80C 'convert':35B,92C 'crash':5A 'cve':10A,13A 'denial':74B 'detect':28B,96C 'entir':70B,126C 'fail':94C 'fatal':55B,120C 'frankenphp':1A,16B,23B,44B,77C,109C 'get':63B 'go':17B,38B,56B,90C,121C 'host':22B 'log':45B,110C 'one':42B,48B,113C 'overflow':58B,123C 'pass':41B,102C 'php':3A,18B,32B,88C,100C 'php-to-go':87C 'process':9A,72B,128C 'recurs':83C 'refer':98C 'referenti':31B,106C 'request':66B 'return':47B,112C 'runtim':19B 'self':21B,30B,105C 'self-host':20B 'self-referenti':29B,104C 'server':8A,71B,127C 'servic':76B 'stack':57B,122C 'termin':68B,124C 'trigger':118C 'uncontrol':82C 'valu':39B 'vulner':84C 'whole':7A 'worker':51B,116C","nicknames":[],"mitigations":[],"who_affected":"Any application running FrankenPHP before 1.13.2 that passes PHP arrays into frankenphp_log() or returns arrays from worker callbacks can be crashed by a request that produces a self-referential array. Applications on a patched version, or that never use these paths with array data, are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["frankenphp","go","high","php","runtime","selfhosted"],"campaign_type":null,"search_a":"'-128020':12A,15A '-2026':11A,14A 'array':4A 'circular':2A 'crash':5A 'cve':10A,13A 'frankenphp':1A 'php':3A 'process':9A 'server':8A 'whole':7A","search_b":"'1.13.2':25B 'array':33B 'attack':60B 'callback':52B 'caus':53B 'convert':35B 'denial':74B 'detect':28B 'entir':70B 'fatal':55B 'frankenphp':16B,23B,44B 'get':63B 'go':17B,38B,56B 'host':22B 'log':45B 'one':42B,48B 'overflow':58B 'pass':41B 'php':18B,32B 'process':72B 'referenti':31B 'request':66B 'return':47B 'runtim':19B 'self':21B,30B 'self-host':20B 'self-referenti':29B 'server':71B 'servic':76B 'stack':57B 'termin':68B 'valu':39B 'worker':51B","search_c":"'1.13.2':79C 'array':91C,101C,107C 'callback':117C 'circular':97C 'contain':80C 'convert':92C 'detect':96C 'entir':126C 'fail':94C 'fatal':120C 'frankenphp':77C,109C 'go':90C,121C 'log':110C 'one':113C 'overflow':123C 'pass':102C 'php':88C,100C 'php-to-go':87C 'process':128C 'recurs':83C 'refer':98C 'referenti':106C 'return':112C 'self':105C 'self-referenti':104C 'server':127C 'stack':122C 'termin':124C 'trigger':118C 'uncontrol':82C 'vulner':84C 'worker':116C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-21T18:29:21+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/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-2026-128020","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128020","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":145340,"url":"https://github.com/php/frankenphp/security/advisories/GHSA-ccgp-ch9h-533f","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-21T18:29:21+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":145341,"url":"https://www.vulncheck.com/advisories/frankenphp-before-1.13.2-denial-of-service-via-cyclic-array-conversion","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"}