Read the docs
TI-2026-86725 Aliases CVE-2026-123583GHSA-cc99-m754-hh53

Missing bailiwick filtering in Hickory DNS negative responses

Priority LOW 27CWE-349Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Hickory DNS hickory-recursor from 0.25.0 through 0.25.2 and hickory-resolver from 0.26.0 before 0.26.2 is affected. The recursive resolver does not filter out-of-bailiwick records from negative responses, so it accepts extraneous untrusted data (CWE-349). An attacker who can supply crafted negative responses can include out-of-bailiwick records to poison the cache and more easily exploit other DNSSEC verification flaws.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

Description from the CNA

The recursive resolver in Hickory DNS hickory-recursor 0.25.0 through 0.25.2 and hickory-resolver 0.26.0 before 0.26.2 does not apply out-of-bailiwick filtering to negative responses. Attackers able to supply crafted negative responses can include out-of-bailiwick records to facilitate cache poisoning and more easily exploit other DNSSEC verification flaws.

Why it matters now

EPSS 0.00118 1st percentileScored 2026-11-08
Fix Fixed hickory-dns (hickory-dns): 0.26.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
hickory-dnshickory-dns0.25.0 – 0.25.2—No fix listedCNA
hickory-dnshickory-dns0.26.0 to before 0.26.20.26.2Patch availableCNA
  • hickory-dns Vendorhickory-dns Affected 0.25.0 – 0.25.2 Fixed in — No fix listed CNA
  • hickory-dns Vendorhickory-dns Affected 0.26.0 to before 0.26.2 Fixed in 0.26.2 Patch available CNA

Remediation

The fixed version for hickory-resolver is 0.26.2. The sources list no fixed version for hickory-recursor.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

  • Fix · CNA hickory-dns (hickory-dns) Fixed in 0.26.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    hickory-dns 0.26.2

    36 records Highest priority Priority LOW 36 LOW

    Other records, highest priority first

    • TI-2026-86748 Resource exhaustion in hickory-dns recursor via glueless NS referralsPriority LOW 38
    • TI-2026-86746 Unbounded retry loop in Hickory DNS resolver enables resource exhaustionPriority LOW 38
    • TI-2026-86730 Denial of service in Hickory DNS recursive resolver via empty poolPriority LOW 38
    Show all 36 records →

Timeline

  1. 2026-11-08 Threatist record created from CVE-2026-123583
  2. 2026-11-08 Alias added: GHSA-cc99-m754-hh53
  3. 2026-11-09 Priority changed: MEDIUM → LOW

References

Advisory 1

  • TI-2025-18857 DNSSEC validation may accept broken authentication chains CVSS 4.0MEDIUM 5.7
  • TI-2026-63089 hickory-resolver before 0.26.2 DNSSEC Validation Bypass CVSS 4.0HIGH 8.7
  • TI-2026-86750 CPU exhaustion in Hickory DNS hickory-proto via BinEncoder name compression CVSS 4.0HIGH 8.7
  • TI-2026-86749 Hickory DNS NSEC3 validation loop enables denial of service CVSS 4.0HIGH 8.7
  • TI-2026-86748 Resource exhaustion in hickory-dns recursor via glueless NS referrals CVSS 4.0HIGH 8.7
  • TI-2026-86746 Unbounded retry loop in Hickory DNS resolver enables resource exhaustion CVSS 4.0HIGH 8.7
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences