{"id":"CVE-2026-121508","kind":"vulnerability","aliases":["CVE-2026-121508"],"related":[],"title":"µD3TN: use-after-free in BPv6 fragmenter lets remote attackers crash the service","description":"Use-After-Free in µD3TN BPv6 Fragmenter Cleanup allows Unauthenticated Remote Attacker to Cause DoS on Allocation Failure","summary":"µD3TN is a Bundle Protocol delay-tolerant networking implementation; a use-after-free in its BPv6 fragmenter cleanup path is triggered when a memory allocation fails. A remote unauthenticated attacker can cause a denial of service.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["bpv6","delay-tolerant-networking","infrastructure","udtn"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-03T15:17:38+00:00","first_seen_at":"2026-11-03T15:22:01+00:00","triaged_at":"2026-11-03T15:23:21+00:00","updated_at":"2026-11-03T15:23:21+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-03T15:23:21Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"µD3TN: use-after-free in BPv6 fragmenter lets remote attackers crash the service","impact":"low","summary":"µD3TN is a Bundle Protocol delay-tolerant networking implementation; a use-after-free in its BPv6 fragmenter cleanup path is triggered when a memory allocation fails. A remote unauthenticated attacker can cause a denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["udtn","bpv6","delay-tolerant-networking"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"remote service crash causing denial of service","analyst_note":"Check the NVD entry and the µD3TN project advisory for affected versions, the fix, and whether BPv6 fragmentation is enabled by default.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000608,"input_tokens":4106,"output_tokens":394,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-121508':17A,20A '-2026':16A,19A 'alloc':54B,83C 'allow':75C 'attack':11A,59B,78C 'bpv6':7A,21B,45B,72C 'bundl':31B 'caus':61B,80C 'cleanup':47B,74C 'crash':12A 'cve':15A,18A 'delay':23B,34B 'delay-toler':33B 'delay-tolerant-network':22B 'denial':63B 'dos':81C 'fail':55B 'failur':84C 'fragment':8A,46B,73C 'free':5A,42B,69C 'implement':37B 'infrastructur':26B 'let':9A 'memori':53B 'network':25B,36B 'path':48B 'protocol':32B 'remot':10A,57B,77C 'servic':14A,65B 'toler':24B,35B 'trigger':50B 'udtn':27B 'unauthent':58B,76C 'use':3A,40B,67C 'use-after-fre':2A,39B,66C 'µd3tn':1A,28B,71C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["bpv6","delaytolerantnetworking","infrastructure","medium","udtn"],"first_public_at":"2026-11-03T15:17:38+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"cve@gitlab.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121508","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121508","severity":null,"published_at":"2026-11-03T15:17:38+00:00","modified_at":"2026-11-03T15:17:38+00:00","first_seen_at":"2026-11-03T15:22:01+00:00","fetched_at":"2026-11-03T15:22:01+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"}