{"id":"CVE-2026-123975","kind":"vulnerability","aliases":["CVE-2026-123975"],"related":[],"title":"Grid Community Toolkit: heap out-of-bounds write lets remote clients crash services","description":"Grid Community Toolkit before 6.2.20261111 (globus-gss-assist before 12.9) contains a heap out-of-bounds write in globus_gss_assist_token_get_fd() triggered by SSLv2 record lengths below 3. Remote unauthenticated clients can send a crafted GSI handshake record to services like globus-gatekeeper and myproxy to corrupt heap memory and crash the service.","summary":"Grid Community Toolkit's globus-gss-assist library writes outside a heap buffer when an SSLv2 record length below 3 is received. A remote unauthenticated client can send a crafted GSI handshake record to services such as globus-gatekeeper and myproxy to corrupt heap memory and crash the service.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["globus","globus-gatekeeper","grid-computing","gsi","myproxy","package"],"not_affected_if":["no-globus-gss-assist"],"how_to_check":"- Check the installed globus-gss-assist version and compare it with the fixed version in the product ranges","fix":"- Grid Community Toolkit: move to `6.2.20261111` or later\n- globus-gss-assist: move to `12.9` or later","status":"open","published_at":"2026-11-13T15:17:34+00:00","first_seen_at":"2026-11-13T15:46:16+00:00","triaged_at":"2026-11-13T15:48:15+00:00","updated_at":"2026-11-13T15:48:15+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-13T15:48:15Z","model":"claude-haiku-5-5","output":{"fix":"- Grid Community Toolkit: move to `6.2.20261111` or later\n- globus-gss-assist: move to `12.9` or later","reach":"network","title":"Grid Community Toolkit: heap out-of-bounds write lets remote clients crash services","impact":"medium","summary":"Grid Community Toolkit's globus-gss-assist library writes outside a heap buffer when an SSLv2 record length below 3 is received. A remote unauthenticated client can send a crafted GSI handshake record to services such as globus-gatekeeper and myproxy to corrupt heap memory and crash the service.","audience":"businesses","category":"package","nicknames":[],"who_cares":["globus","grid-computing","globus-gatekeeper","myproxy","gsi"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"remote crash of grid services via heap corruption","analyst_note":"Confirm whether globus-gatekeeper and myproxy are exposed by default and check the Patch and Release notes links on github.com for the fixed versions.","how_to_check":"- Check the installed globus-gss-assist version and compare it with the fixed version in the product ranges\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-globus-gss-assist"],"who_is_affected":"Systems running Grid Community Toolkit services that use globus-gss-assist, such as globus-gatekeeper and myproxy, are exposed when they accept GSI handshake connections from the network. Sources do not say whether non-default configuration is required.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000754,"input_tokens":4652,"output_tokens":578,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123975':17A,20A '-2026':16A,19A '12.9':92C '3':51B,114C '6.2.20261111':86C 'assist':38B,90C,104C 'bound':8A,99C 'buffer':44B 'client':12A,57B,117C 'communiti':2A,32B,83C 'comput':27B 'contain':93C 'corrupt':75B,134C 'craft':61B,121C 'crash':13A,79B,138C 'cve':15A,18A 'fd':107C 'gatekeep':24B,71B,130C 'get':106C 'globus':21B,23B,36B,70B,88C,102C,129C 'globus-gatekeep':22B,69B,128C 'globus-gss-assist':35B,87C 'grid':1A,26B,31B,82C 'grid-comput':25B 'gsi':28B,62B,122C 'gss':37B,89C,103C 'handshak':63B,123C 'heap':4A,43B,76B,95C,135C 'length':49B,112C 'let':10A 'librari':39B 'like':127C 'memori':77B,136C 'myproxi':29B,73B,132C 'out-of-bound':5A,96C 'outsid':41B 'packag':30B 'receiv':53B 'record':48B,64B,111C,124C 'remot':11A,55B,115C 'send':59B,119C 'servic':14A,66B,81B,126C,140C 'sslv2':47B,110C 'token':105C 'toolkit':3A,33B,84C 'trigger':108C 'unauthent':56B,116C 'write':9A,40B,100C","nicknames":[],"mitigations":[],"who_affected":"Systems running Grid Community Toolkit services that use globus-gss-assist, such as globus-gatekeeper and myproxy, are exposed when they accept GSI handshake connections from the network. Sources do not say whether non-default configuration is required.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["globus","globusgatekeeper","gridcomputing","gsi","high","myproxy","package"],"campaign_type":null,"search_a":"'-123975':17A,20A '-2026':16A,19A 'bound':8A 'client':12A 'communiti':2A 'crash':13A 'cve':15A,18A 'grid':1A 'heap':4A 'let':10A 'out-of-bound':5A 'remot':11A 'servic':14A 'toolkit':3A 'write':9A","search_b":"'3':51B 'assist':38B 'buffer':44B 'client':57B 'communiti':32B 'comput':27B 'corrupt':75B 'craft':61B 'crash':79B 'gatekeep':24B,71B 'globus':21B,23B,36B,70B 'globus-gatekeep':22B,69B 'globus-gss-assist':35B 'grid':26B,31B 'grid-comput':25B 'gsi':28B,62B 'gss':37B 'handshak':63B 'heap':43B,76B 'length':49B 'librari':39B 'memori':77B 'myproxi':29B,73B 'outsid':41B 'packag':30B 'receiv':53B 'record':48B,64B 'remot':55B 'send':59B 'servic':66B,81B 'sslv2':47B 'toolkit':33B 'unauthent':56B 'write':40B","search_c":"'12.9':92C '3':114C '6.2.20261111':86C 'assist':90C,104C 'bound':99C 'client':117C 'communiti':83C 'contain':93C 'corrupt':134C 'craft':121C 'crash':138C 'fd':107C 'gatekeep':130C 'get':106C 'globus':88C,102C,129C 'globus-gatekeep':128C 'globus-gss-assist':87C 'grid':82C 'gsi':122C 'gss':89C,103C 'handshak':123C 'heap':95C,135C 'length':112C 'like':127C 'memori':136C 'myproxi':132C 'out-of-bound':96C 'record':111C,124C 'remot':115C 'send':119C 'servic':126C,140C 'sslv2':110C 'token':105C 'toolkit':84C 'trigger':108C 'unauthent':116C 'write':100C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T15:17:34+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-2026-123975","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123975","severity":null,"published_at":"2026-11-13T15:17:34+00:00","modified_at":"2026-11-13T15:17:34+00:00","first_seen_at":"2026-11-13T15:46:16+00:00","fetched_at":"2026-11-13T15:46:16+00:00","note":null}],"documents":[{"id":147256,"url":"https://github.com/gridcf/gct/commit/3df2be4834c146bdcec90009a0f2e5771ff63cca","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":147257,"url":"https://github.com/gridcf/gct/releases/tag/v6.2.20261111","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":147258,"url":"https://www.vulncheck.com/advisories/grid-community-toolkit-globus-gss-assist-before-12.9-pre-authentication-heap-out-of-bounds-write","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"}