{"id":"CVE-2026-123598","kind":"vulnerability","aliases":["CVE-2026-123598"],"related":[],"title":"Hickory DNS: bogus DNSSEC answers cached for up to 24 hours","description":"The validating recursor in Hickory DNS hickory-recursor 0.25.0 through 0.26.0-alpha.1, hickory-resolver 0.26.0-alpha.1 before 0.26.2, and hickory-net 0.26.0-beta.1 before 0.26.2 caches DNSSEC-bogus answers using the untrusted, attacker-supplied record TTL (capped at 24 hours) instead of a short validation-failure TTL. A remote attacker who spoofs a single authoritative response with an invalid signature and a long TTL can keep the bogus result cached for up to 24 hours.","summary":"The validating DNS recursor in Hickory DNS caches DNSSEC-bogus answers using the attacker-supplied record TTL instead of a short failure TTL. A remote attacker who spoofs one authoritative response with an invalid signature and a long TTL can keep the bad result cached for up to 24 hours.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["dns","dnssec","hickory-dns","package","rust"],"not_affected_if":["managed-dns","no-dnssec-validation","system-resolver"],"how_to_check":"- Check the version of hickory-recursor, hickory-resolver or hickory-net in your Cargo.lock, for example with `cargo tree -i hickory-resolver`\n- Confirm whether the service runs the validating recursor with DNSSEC validation enabled","fix":"- hickory-resolver and hickory-net: move to `0.26.2` or later\n- hickory-recursor: the fixed version is not stated in the sources given; unknown","status":"open","published_at":"2026-11-08T02:16:54+00:00","first_seen_at":"2026-11-08T02:21:13+00:00","triaged_at":"2026-11-08T02:24:56+00:00","updated_at":"2026-11-08T02:24:56+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-08T02:24:56Z","model":"claude-haiku-5-5","output":{"fix":"- hickory-resolver and hickory-net: move to `0.26.2` or later\n- hickory-recursor: the fixed version is not stated in the sources given; unknown","reach":"network","title":"Hickory DNS: bogus DNSSEC answers cached for up to 24 hours","impact":"medium","summary":"The validating DNS recursor in Hickory DNS caches DNSSEC-bogus answers using the attacker-supplied record TTL instead of a short failure TTL. A remote attacker who spoofs one authoritative response with an invalid signature and a long TTL can keep the bad result cached for up to 24 hours.","audience":"developers","category":"package","nicknames":[],"who_cares":["rust","hickory-dns","dns","dnssec"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"bogus DNS answers served to clients for up to 24 hours","analyst_note":"Confirm the fixed version for hickory-recursor, which the sources do not state; check the vendor advisory on github.com and the VulnCheck advisory.","how_to_check":"- Check the version of hickory-recursor, hickory-resolver or hickory-net in your Cargo.lock, for example with `cargo tree -i hickory-resolver`\n- Confirm whether the service runs the validating recursor with DNSSEC validation enabled","plain_action":"","needs_analyst":true,"not_affected_if":["no-dnssec-validation","system-resolver","managed-dns"],"who_is_affected":"Teams that build Rust software on the Hickory DNS libraries and run the validating recursor or resolver with DNSSEC validation. Applications that only use a system or public resolver, or that do not enable DNSSEC validation, are not exposed through this path.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000759,"input_tokens":4379,"output_tokens":643,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123598':14A,17A '-2026':13A,16A '0.25.0':86C '0.26.0':88C,93C,101C '0.26.2':96C,104C '24':10A,75B,120C,156C 'alpha.1':89C,94C 'answer':5A,36B,109C 'attack':40B,52B,114C,132C 'attacker-suppli':39B,113C 'authorit':56B,137C 'bad':69B 'beta.1':102C 'bogus':3A,35B,108C,150C 'cach':6A,32B,71B,105C,152C 'cap':118C 'cve':12A,15A 'dns':2A,18B,22B,27B,31B,82C 'dnssec':4A,19B,34B,107C 'dnssec-bogus':33B,106C 'failur':48B,128C 'hickori':1A,21B,30B,81C,84C,91C,99C 'hickory-dn':20B 'hickory-net':98C 'hickory-recursor':83C 'hickory-resolv':90C 'hour':11A,76B,121C,157C 'instead':44B,122C 'invalid':60B,141C 'keep':67B,148C 'long':64B,145C 'net':100C 'one':55B 'packag':23B 'record':42B,116C 'recursor':28B,79C,85C 'remot':51B,131C 'resolv':92C 'respons':57B,138C 'result':70B,151C 'rust':24B 'short':47B,125C 'signatur':61B,142C 'singl':136C 'spoof':54B,134C 'suppli':41B,115C 'ttl':43B,49B,65B,117C,129C,146C 'untrust':112C 'use':37B,110C 'valid':26B,78C,127C 'validation-failur':126C","nicknames":[],"mitigations":[],"who_affected":"Teams that build Rust software on the Hickory DNS libraries and run the validating recursor or resolver with DNSSEC validation. Applications that only use a system or public resolver, or that do not enable DNSSEC validation, are not exposed through this path.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["dns","dnssec","hickorydns","medium","package","rust"],"campaign_type":null,"search_a":"'-123598':14A,17A '-2026':13A,16A '24':10A 'answer':5A 'bogus':3A 'cach':6A 'cve':12A,15A 'dns':2A 'dnssec':4A 'hickori':1A 'hour':11A","search_b":"'24':75B 'answer':36B 'attack':40B,52B 'attacker-suppli':39B 'authorit':56B 'bad':69B 'bogus':35B 'cach':32B,71B 'dns':18B,22B,27B,31B 'dnssec':19B,34B 'dnssec-bogus':33B 'failur':48B 'hickori':21B,30B 'hickory-dn':20B 'hour':76B 'instead':44B 'invalid':60B 'keep':67B 'long':64B 'one':55B 'packag':23B 'record':42B 'recursor':28B 'remot':51B 'respons':57B 'result':70B 'rust':24B 'short':47B 'signatur':61B 'spoof':54B 'suppli':41B 'ttl':43B,49B,65B 'use':37B 'valid':26B","search_c":"'0.25.0':86C '0.26.0':88C,93C,101C '0.26.2':96C,104C '24':120C,156C 'alpha.1':89C,94C 'answer':109C 'attack':114C,132C 'attacker-suppli':113C 'authorit':137C 'beta.1':102C 'bogus':108C,150C 'cach':105C,152C 'cap':118C 'dns':82C 'dnssec':107C 'dnssec-bogus':106C 'failur':128C 'hickori':81C,84C,91C,99C 'hickory-net':98C 'hickory-recursor':83C 'hickory-resolv':90C 'hour':121C,157C 'instead':122C 'invalid':141C 'keep':148C 'long':145C 'net':100C 'record':116C 'recursor':79C,85C 'remot':131C 'resolv':92C 'respons':138C 'result':151C 'short':125C 'signatur':142C 'singl':136C 'spoof':134C 'suppli':115C 'ttl':117C,129C,146C 'untrust':112C 'use':110C 'valid':78C,127C 'validation-failur':126C","first_public_at":"2026-09-03T21:54:40+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/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-2026-123598","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123598","severity":null,"published_at":"2026-11-08T02:16:54+00:00","modified_at":"2026-11-08T02:16:54+00:00","first_seen_at":"2026-11-08T02:21:13+00:00","fetched_at":"2026-11-08T02:21:13+00:00","note":null}],"documents":[{"id":99347,"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-29q9-p769-j8gq","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-09-03T21:54:40+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99348,"url":"https://www.vulncheck.com/advisories/hickory-dns-0.25.0-through-0.26.0-alpha.1-dnssec-bogus-answer-cache-poisoning","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"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}