Improper Access Control Affecting rust-hickory-server package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-ECHOLATEST-RUSTHICKORYSERVER-22382582
  • published9 Nov 2026
  • disclosed8 Nov 2026

Introduced: 8 Nov 2026

NewCVE-2026-123603  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest rust-hickory-server.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-hickory-server package and not the rust-hickory-server package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-recursor 0.25.0-alpha.3 through 0.26.0-alpha.1 fail to canonicalize IPv4-mapped IPv6 addresses when checking deny_answers, deny_server, or AccessControlSet rules. Attackers can use IPv4-mapped addresses to evade answer filtering, trigger queries to denied nameservers, or reach hickory-server library deployments on dual-stack IPv6 sockets from denied clients.

CVSS Base Scores

version 3.1