High severity7.5NVD Advisory· Published Nov 8, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Hickory DNS/Hickory DNSllm-fuzzy
Range: <0.26.2

Patches

Vulnerability mechanics

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-x962-5xwx-fr8xnvd
www.vulncheck.com/advisories/hickory-dns-from-0.26.0-before-0.26.2-panic-via-tsig-rdata-decodingnvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000