{"id":"CVE-2026-123571","title":"Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding","summary":"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 t…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-191"],"vendor":"hickory-dns","product":"hickory-dns","affected":["hickory-dns >= 0.26.0 < 0.26.2"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:08.593Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123571","references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-x962-5xwx-fr8x","label":"GitHub Security Advisory (GHSA-x962-5xwx-fr8x)"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-from-0.26.0-before-0.26.2-panic-via-tsig-rdata-decoding","label":"VulnCheck Advisory: Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.658Z","slug":"CVE-2026-123571","body":"## Overview\n\nHickory 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.\n\n## Affected\n\n- `hickory-dns >= 0.26.0 < 0.26.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}