CVE-2026-93657: Improper Verification of Cryptographic Signature in hickory-dns hickory-resolver
CVE-2026-93657 affects hickory-resolver versions before 0.26.2 and involves improper verification of cryptographic signatures in DNSSEC validation. The resolver fails to propagate bogus DNSSEC proof states through its lookup APIs, allowing invalid DNS records to be accepted as valid. This vulnerability enables attackers who control the DNS answering zone or are on the network path to bypass DNSSEC authentication checks and return forged DNS records.
AI Analysis
Technical Summary
The vulnerability in hickory-resolver prior to version 0.26.2 is due to failure in propagating invalid DNSSEC proof states through the Resolver::lookup() and Resolver::lookup_ip() APIs. This flaw allows attackers controlling the DNS answering zone or positioned on the network path to have forged DNS records accepted as validated, effectively bypassing DNSSEC authentication. The CVSS 4.0 score is 8.7, indicating a high severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on integrity.
Potential Impact
Attackers can bypass DNSSEC authentication checks and cause the resolver to accept forged DNS records as valid. This undermines the integrity of DNS responses, potentially leading to redirection to malicious sites or other attacks relying on DNS spoofing.
Mitigation Recommendations
A fix is available in hickory-resolver version 0.26.2. Users should upgrade to version 0.26.2 or later to remediate this vulnerability.
CVE-2026-93657: Improper Verification of Cryptographic Signature in hickory-dns hickory-resolver
Description
CVE-2026-93657 affects hickory-resolver versions before 0.26.2 and involves improper verification of cryptographic signatures in DNSSEC validation. The resolver fails to propagate bogus DNSSEC proof states through its lookup APIs, allowing invalid DNS records to be accepted as valid. This vulnerability enables attackers who control the DNS answering zone or are on the network path to bypass DNSSEC authentication checks and return forged DNS records.
CVSS v4.0
Score 8.7high
Affected software
hickory-dns
hickory-resolver
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in hickory-resolver prior to version 0.26.2 is due to failure in propagating invalid DNSSEC proof states through the Resolver::lookup() and Resolver::lookup_ip() APIs. This flaw allows attackers controlling the DNS answering zone or positioned on the network path to have forged DNS records accepted as validated, effectively bypassing DNSSEC authentication. The CVSS 4.0 score is 8.7, indicating a high severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on integrity.
Potential Impact
Attackers can bypass DNSSEC authentication checks and cause the resolver to accept forged DNS records as valid. This undermines the integrity of DNS responses, potentially leading to redirection to malicious sites or other attacks relying on DNS spoofing.
Mitigation Recommendations
A fix is available in hickory-resolver version 0.26.2. Users should upgrade to version 0.26.2 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-18T13:30:25.560Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aadb77255bf5e2cf59e641c
Added to database: 09/18/2026, 22:13:06 UTC
Last enriched: 09/18/2026, 22:15:22 UTC
Last updated: 09/19/2026, 00:37:37 UTC
Views: 3
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