# CVE-2026-123583: Hickory DNS 0.25.0 through 0.25.2 Missing Bailiwick Filtering on Negative Responses

Status: published. Published: 2026-11-08. Updated: 2026-11-08.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- hickory-dns / hickory-dns (hickory-recursor): ≥ 0.25.0; ≤ 0.25.2 (affected, semver). Source: CNA: VulnCheck
- hickory-dns / hickory-dns (hickory-resolver): ≥ 0.26.0; < 0.26.2 (affected, semver); 0.26.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-349

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-vcjp-57rr-mpfw (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/hickory-dns-0.25.0-through-0.25.2-missing-bailiwick-filtering-on-negative-responses (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-123583; retrieved 2026-11-08; source updated 2026-11-08

Revision: 366ed10ecadacd7bcc4fa12c42634469df5472a68443ba32af4f66e118c819e5

Canonical: https://y2.dev/cve/CVE-2026-123583

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