8.7

CVE-2026-93657: hickory-dns hickory-resolver

CVSS: 8.7v4.0HighDeferred
AliasesUBUNTU-CVE-2026-93657DEBIAN-CVE-2026-93657GHSA-5j98-2g5x-46v6
Published 18-09-2026Last modified 21-09-2026
Open JSON

Vulnerability summary

CVE-2026-93657 is a high (CVSS 8.7) vulnerability in hickory-dns hickory-resolver. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.9% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
OPENSUSE-SU-2026:11923-1RHSA-2026:85848

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 21-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

8 scores · 5 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.17 pp

From 0.23% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Crates.Io1 product
  • hickory-resolver< 0.26.2
Debian1 product
  • rust-hickory-resolverAll versions (No fix recorded) | < 0.26.3-1
Hickory-dns1 product
Ubuntu1 product
  • rust-hickory-resolverAll versions (No fix recorded)

4 vendors · 4 products

References

10 links