CVE-2026-123571
Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | hickory-dns |
| Product | hickory-dns |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
hickory-dns / hickory-dns
0.26.0 < 0.26.2
References
Credits
🔍 JasonPap