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Back to active CVEs
High · CVSS 8.7CVE-2026-123576

Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC RequestsCVE-2026-123576

Answer in brief

CVE-2026-123576 records a High severity (CVSS 8.7) vulnerability in Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC Requests. 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
Not reported

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>=0.24.0 <=0.26.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for hickory-dns/hickory-dns.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

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 0.24.0 through 0.26.1 contains a memory exhaustion vulnerability that allows remote attackers to consume server resources by sending incomplete DNS-over-QUIC request bodies. Attackers can open many connections and send only large length prefixes, causing pre-allocated buffers to persist without timeout and exhausting server memory.

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 from 0.26.0 before 0.26.2 Panic via TSIG RDATA DecodingSame 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

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 8, 2026
References
2 linked sources
Open source record