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Vulnerability · Published Sep 18, 2026 · Assigned by VulnCheck

CVE-2026-93657hickory-resolver before 0.26.2 DNSSEC Validation Bypass

High 7.5

In plain English

A high-severity security flaw in hickory-resolver from hickory-dns. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 86.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

hickory-resolver versions before 0.26.2 fail to propagate bogus DNSSEC proof states through the Resolver::lookup() and Resolver::lookup_ip() APIs, allowing invalid records to be returned as successful results. Attackers controlling the answering zone or positioned on the network path can have forged DNS records accepted as validated, bypassing DNSSEC authentication checks.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10sequoia-sq1.4.0.1-4.el10_2ALSA-2026:85848
Debian:13rust-hickory-resolverno fix listedDEBIAN-CVE-2026-93657
Debian:14rust-hickory-resolver0.26.3-1DEBIAN-CVE-2026-93657
Rocky Linux:10rust-sequoia-sq0:1.4.0.1-4.el10_2RLSA-2026:85848
Ubuntu:24.04:LTSrust-hickory-resolverno fix listedUBUNTU-CVE-2026-93657
Ubuntu:26.04:LTSrust-hickory-resolverno fix listedUBUNTU-CVE-2026-93657
Ubuntu:26.10rust-hickory-resolverno fix listedUBUNTU-CVE-2026-93657

Affected products (as reported)

VendorProductVersions
hickory-dns hickory-resolver 0 – before 0.26.2

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References