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Back to active CVEs
High · CVSS 8.7CVE-2026-123571

Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA DecodingCVE-2026-123571

Answer in brief

CVE-2026-123571 records a High severity (CVSS 8.7) vulnerability in Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding. The current sources do not mark it as known exploited. The current feed maps hickory-dns/hickory-dns (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps hickory-dns/hickory-dns (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
hickory-dns/hickory-dnsgeneric>=0.26.0 <0.26.20.26.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for hickory-dns/hickory-dns.
  2. 2Review the reported fix. Update hickory-dns/hickory-dns to 0.26.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 8, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR CountsSame hickory-dns/hickory-dns package
  • Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone ParserSame hickory-dns/hickory-dns package
  • hickory-dns from 0.20.1 before 0.26.2 Panic in SVCB/HTTPS Zone File ParserSame hickory-dns/hickory-dns package
  • Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File ParserSame hickory-dns/hickory-dns package
  • Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request BodiesSame hickory-dns/hickory-dns package
  • Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC RequestsSame hickory-dns/hickory-dns package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-191
Source
CVE List V5
Source checked
Nov 8, 2026
References
2 linked sources
Open source record