{"id":"CVE-2026-123571","aliases":["DEBIAN-CVE-2026-123571","EUVD-2026-119456","GHSA-p8hx-6263-88h9","GHSA-x962-5xwx-fr8x","RUSTSEC-2026-0488","UBUNTU-CVE-2026-123571"],"status":"published","title":"Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00409,"percentile":0.35674,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-191"],"published":"2026-09-03T12:00:00Z","modified":"2026-11-11T12:30:02Z","fixes":[{"ecosystem":"Debian:14","package":"rust-hickory-dns","fixed_in":["0.26.3-1"],"sources":["osv"]},{"ecosystem":"crates.io","package":"hickory-proto","fixed_in":["0.26.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:13","package":"rust-hickory-dns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.4-1","0.25.2-1","0.25.2-2","0.25.2-3","0.26.1-1","0.26.1-2","0.26.3-1"]},{"source":"osv","ecosystem":"Debian:14","package":"rust-hickory-dns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.26.3-1"}]}],"versions":["0.24.4-1","0.25.2-1","0.25.2-2","0.25.2-3","0.26.1-1","0.26.1-2"]},{"source":"osv","ecosystem":"crates.io","package":"hickory-proto","ranges":[{"type":"SEMVER","events":[{"introduced":"0.26.0"},{"fixed":"0.26.2"}]}]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"rust-hickory-dns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.4-1","0.25.2-3","0.26.1-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"rust-hickory-dns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.4-1"]}],"products":[{"vendor":"hickory-dns","product":"hickory-dns"}],"references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-x962-5xwx-fr8x","tags":["vendor-advisory","advisory","report"]},{"url":"https://www.vulncheck.com/advisories/hickory-dns-from-0.26.0-before-0.26.2-panic-via-tsig-rdata-decoding","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123571","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p8hx-6263-88h9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123571.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-123571","tags":["advisory"]},{"url":"https://crates.io/crates/hickory-proto","tags":["package"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0488.html","tags":["advisory"]},{"url":"https://github.com/hickory-dns/hickory-dns/commit/b1246a8a21b6dcc34d427a7d39dd96e10825c384","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-123571","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-123571","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-123571","title":"Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T01:38:08.593Z","modified":"2026-11-08T01:38:08.593Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-191"],"updated_at":"2026-11-08T02:36:49.037074Z"}],"euvd":[{"id":"EUVD-2026-119456","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T01:38:08Z","modified":"2026-11-08T01:38:08Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-08T06:12:04.782489Z"}],"ghsa":[{"id":"GHSA-p8hx-6263-88h9","title":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA...","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T03:30:34Z","modified":"2026-11-08T03:30:39Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-191"],"updated_at":"2026-11-08T03:41:53.166172Z"}],"nvd":[{"id":"CVE-2026-123571","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T02:16:49.99Z","modified":"2026-11-10T22:15:59.797Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-191"],"updated_at":"2026-11-08T07:09:05.855788Z"}],"osv":[{"id":"CVE-2026-123571","title":"Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T01:38:08.593Z","modified":"2026-11-12T02:48:34.964829703Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-191"],"updated_at":"2026-11-12T03:30:48.739835Z"},{"id":"DEBIAN-CVE-2026-123571","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-08T02:16:49.99Z","modified":"2026-11-11T09:47:31.815922629Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-08T15:06:31.529325Z"},{"id":"UBUNTU-CVE-2026-123571","description":"Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.","status":"published","published":"2026-11-09T00:00:00Z","modified":"2026-11-10T02:49:53.304598042Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-10T03:18:58.105788Z"},{"id":"RUSTSEC-2026-0488","title":"Integer underflow when reporting a malformed TSIG record","description":"When a TSIG record is decoded from the DNS wire format, its MAC length and \"other data\" length are checked against the end of the record data. If a check failed, the error value was built from `end_idx - decoder.index()`. For a malformed record the decoder can already be past `end_idx`, so this unsigned subtraction underflows.\n\nIn builds with overflow checks enabled (the `dev` profile by default) the underflow panics, so a peer that sends a crafted TSIG record can crash the process. In builds without overflow checks the result wraps and is only used in the returned error.\n\nThe fix returns a plain \"insufficient bytes\" error without the subtraction. It is in 0.26.2.","status":"published","published":"2026-09-03T12:00:00Z","modified":"2026-11-11T12:30:02.89619645Z","updated_at":"2026-11-11T12:38:19.196194Z"}]}}