CVE-2026-123591

Public on 2026-11-08
Modified on 2026-11-12
Description
Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 fail to verify, per RFC 6840 ยง4.4, that an NSEC or NSEC3 record denying a DS RRset also proves the delegation's NS record exists. Attackers can reuse child-side NSEC or NSEC3 records to fake an insecure delegation and forge child-zone records.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
5.9
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2023 aardvark-dns Not Affected
Amazon Linux 2027 Preview aardvark-dns Not Affected
Amazon Linux 2 - Aws-nitro-enclaves-cli Extra aws-nitro-enclaves-cli Not Affected
Amazon Linux 2023 aws-nitro-enclaves-cli Not Affected
Amazon Linux 2027 Preview aws-nitro-enclaves-cli Not Affected

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-123591 Mitre: CVE-2026-123591