{"id":"CVE-2026-124000","kind":"vulnerability","aliases":["CVE-2026-124000"],"related":[],"title":"NASA ION-DTN amsd: crafted messages overflow heap and crash configuration server","description":"NASA JPL ION-DTN 2.1.0 through 4.2.0 contains a heap buffer under-allocation vulnerability in the Asynchronous Message Service daemon (amsd) that allows a rogue or misconfigured peer to trigger an out-of-bounds write by sending crafted Meta-AMS (MAMS) configuration management messages that are processed without cryptographic authentication. Attackers can exploit the insufficient buffer size calculation for the internal state-event object to crash the active Configuration Server thread, causing a denial of service and potentially destabilizing subsequent shared-memory allocations in amsd.","summary":"NASA JPL ION-DTN, a delay-tolerant networking suite, has a heap under-allocation in its Asynchronous Message Service daemon (amsd) affecting versions 2.1.0 through 4.2.0. A rogue or misconfigured peer sending unauthenticated Meta-AMS configuration messages can trigger an out-of-bounds write that crashes the Configuration Server thread, causing denial of service and possibly destabilizing later shared-memory allocations.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["amsd","infrastructure","ion-dtn","self-hosted","space-networking"],"not_affected_if":["amsd-not-running","no-ams-peers"],"how_to_check":"- Check the installed ION-DTN version against the affected range `2.1.0` through `4.2.0`\n- Check whether `amsd` is running and reachable from peers that are not fully trusted, unknown if the sources say more","fix":"- Move ION-DTN past `4.2.0`; the exact fixed version is unknown from the sources given","status":"open","published_at":"2026-11-09T19:16:47+00:00","first_seen_at":"2026-11-09T19:28:14+00:00","triaged_at":"2026-11-09T19:30:24+00:00","updated_at":"2026-11-09T19:30:24+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-09T19:30:24Z","model":"claude-haiku-5-5","output":{"fix":"- Move ION-DTN past `4.2.0`; the exact fixed version is unknown from the sources given","reach":"network","title":"NASA ION-DTN amsd: crafted messages overflow heap and crash configuration server","impact":"low","summary":"NASA JPL ION-DTN, a delay-tolerant networking suite, has a heap under-allocation in its Asynchronous Message Service daemon (amsd) affecting versions 2.1.0 through 4.2.0. A rogue or misconfigured peer sending unauthenticated Meta-AMS configuration messages can trigger an out-of-bounds write that crashes the Configuration Server thread, causing denial of service and possibly destabilizing later shared-memory allocations.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["ion-dtn","amsd","space-networking","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"amsd Configuration Server thread crashes, denial of service","analyst_note":"Confirm the fixed ION-DTN version and whether amsd listens by default, using the vendor advisory and release notes linked in the signal.","how_to_check":"- Check the installed ION-DTN version against the affected range `2.1.0` through `4.2.0`\n- Check whether `amsd` is running and reachable from peers that are not fully trusted, unknown if the sources say more","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-ams-peers","amsd-not-running"],"who_is_affected":"Teams running ION-DTN 2.1.0 through 4.2.0 with amsd exposed to peers that send Meta-AMS configuration messages. The sources describe no authentication on those messages, so any peer that can reach the daemon may send them; deployments with no AMS peers may skip it.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000812,"input_tokens":4730,"output_tokens":677,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-124000':16A,19A '-2026':15A,18A '2.1.0':57B,103C '4.2.0':59B,105C 'activ':170C 'affect':55B 'alloc':47B,97B,112C,186C 'allow':122C 'am':69B,141C 'amsd':5A,20B,54B,120C,188C 'asynchron':50B,116C 'attack':152C 'authent':151C 'bound':78B,134C 'buffer':109C,157C 'calcul':159C 'caus':86B,174C 'configur':12A,70B,83B,143C,171C 'contain':106C 'craft':6A,138C 'crash':11A,81B,168C 'cryptograph':150C 'cve':14A,17A 'daemon':53B,119C 'delay':38B 'delay-toler':37B 'denial':87B,176C 'destabil':92B,181C 'dtn':4A,24B,35B,102C 'event':165C 'exploit':154C 'heap':9A,44B,108C 'host':27B 'infrastructur':21B 'insuffici':156C 'intern':162C 'ion':3A,23B,34B,101C 'ion-dtn':2A,22B,33B,100C 'jpl':32B,99C 'later':93B 'mam':142C 'manag':144C 'memori':96B,185C 'messag':7A,51B,71B,117C,145C 'meta':68B,140C 'meta-am':67B,139C 'misconfigur':63B,126C 'nasa':1A,31B,98C 'network':30B,40B 'object':166C 'out-of-bound':75B,131C 'overflow':8A 'peer':64B,127C 'possibl':91B 'potenti':180C 'process':148C 'rogu':61B,124C 'self':26B 'self-host':25B 'send':65B,137C 'server':13A,84B,172C 'servic':52B,89B,118C,178C 'share':95B,184C 'shared-memori':94B,183C 'size':158C 'space':29B 'space-network':28B 'state':164C 'state-ev':163C 'subsequ':182C 'suit':41B 'thread':85B,173C 'toler':39B 'trigger':73B,129C 'unauthent':66B 'under-alloc':45B,110C 'version':56B 'vulner':113C 'without':149C 'write':79B,135C","nicknames":[],"mitigations":[],"who_affected":"Teams running ION-DTN 2.1.0 through 4.2.0 with amsd exposed to peers that send Meta-AMS configuration messages. The sources describe no authentication on those messages, so any peer that can reach the daemon may send them; deployments with no AMS peers may skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["amsd","infrastructure","iondtn","medium","selfhosted","spacenetworking"],"campaign_type":null,"search_a":"'-124000':16A,19A '-2026':15A,18A 'amsd':5A 'configur':12A 'craft':6A 'crash':11A 'cve':14A,17A 'dtn':4A 'heap':9A 'ion':3A 'ion-dtn':2A 'messag':7A 'nasa':1A 'overflow':8A 'server':13A","search_b":"'2.1.0':57B '4.2.0':59B 'affect':55B 'alloc':47B,97B 'am':69B 'amsd':20B,54B 'asynchron':50B 'bound':78B 'caus':86B 'configur':70B,83B 'crash':81B 'daemon':53B 'delay':38B 'delay-toler':37B 'denial':87B 'destabil':92B 'dtn':24B,35B 'heap':44B 'host':27B 'infrastructur':21B 'ion':23B,34B 'ion-dtn':22B,33B 'jpl':32B 'later':93B 'memori':96B 'messag':51B,71B 'meta':68B 'meta-am':67B 'misconfigur':63B 'nasa':31B 'network':30B,40B 'out-of-bound':75B 'peer':64B 'possibl':91B 'rogu':61B 'self':26B 'self-host':25B 'send':65B 'server':84B 'servic':52B,89B 'share':95B 'shared-memori':94B 'space':29B 'space-network':28B 'suit':41B 'thread':85B 'toler':39B 'trigger':73B 'unauthent':66B 'under-alloc':45B 'version':56B 'write':79B","search_c":"'2.1.0':103C '4.2.0':105C 'activ':170C 'alloc':112C,186C 'allow':122C 'am':141C 'amsd':120C,188C 'asynchron':116C 'attack':152C 'authent':151C 'bound':134C 'buffer':109C,157C 'calcul':159C 'caus':174C 'configur':143C,171C 'contain':106C 'craft':138C 'crash':168C 'cryptograph':150C 'daemon':119C 'denial':176C 'destabil':181C 'dtn':102C 'event':165C 'exploit':154C 'heap':108C 'insuffici':156C 'intern':162C 'ion':101C 'ion-dtn':100C 'jpl':99C 'mam':142C 'manag':144C 'memori':185C 'messag':117C,145C 'meta':140C 'meta-am':139C 'misconfigur':126C 'nasa':98C 'object':166C 'out-of-bound':131C 'peer':127C 'potenti':180C 'process':148C 'rogu':124C 'send':137C 'server':172C 'servic':118C,178C 'share':184C 'shared-memori':183C 'size':158C 'state':164C 'state-ev':163C 'subsequ':182C 'thread':173C 'trigger':129C 'under-alloc':110C 'vulner':113C 'without':149C 'write':135C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-07T00:28:34+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA: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-2026-124000","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124000","severity":null,"published_at":"2026-11-09T19:16:47+00:00","modified_at":"2026-11-09T19:16:47+00:00","first_seen_at":"2026-11-09T19:28:14+00:00","fetched_at":"2026-11-09T19:28:14+00:00","note":null}],"documents":[{"id":109178,"url":"https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2","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":109182,"url":"https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-h28r-fr59-c79c","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-07T00:28:34+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":109183,"url":"https://www.vulncheck.com/advisories/ion-dtn-heap-buffer-under-allocation-dos-in-amsd","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"}