CVE-2026-123572

Public on 2026-11-08
Modified on 2026-11-12
Description
Hickory-dns from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation format parser, which panics on malformed alpn values. Attackers can supply untrusted zone files with unbalanced quotes, consecutive commas, or invalid escapes in alpn parameters to crash parsing processes.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2023 aardvark-dns Pending Fix
Amazon Linux 2027 Preview aardvark-dns Pending Fix
Amazon Linux 2 - Aws-nitro-enclaves-cli Extra aws-nitro-enclaves-cli Pending Fix
Amazon Linux 2023 aws-nitro-enclaves-cli Pending Fix
Amazon Linux 2027 Preview aws-nitro-enclaves-cli Pending Fix

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-123572 Mitre: CVE-2026-123572