Insufficient Verification of Data Authenticity Affecting rust-hickory-net package, versions <0.26.3-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.19% (9th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-RUSTHICKORYNET-22382273
  • published9 Nov 2026
  • disclosed8 Nov 2026

Introduced: 8 Nov 2026

NewCVE-2026-123596  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Debian:unstable rust-hickory-net to version 0.26.3-1 or higher.

NVD Description

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

Hickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain a DNSSEC validation flaw in the validating recursor's NSEC handler that accepts parent-side ancestor-delegation NSEC records as proof of nonexistence for names below the zone cut. An on-path attacker, rogue parent nameserver, or attacker winning a port and TXID race can deliver one forged NXDOMAIN response built from genuinely signed parent NSEC records, causing authenticated denial of existing child-zone names cached for the negative TTL.

CVSS Base Scores

version 3.1