CVE-2026-123576

Public on 2026-11-08
Modified on 2026-11-12
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.
Severity
Important severity
Important
See what this means
CVSS v3 Base Score
7.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
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 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-123576 Mitre: CVE-2026-123576