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Fencer Vulns
high 7.5

CVE-2026-93657 json

hickory-resolver before 0.26.2 DNSSEC Validation Bypass

published 2026-09-18 52 d ago modified 2026-10-05 34 d ago also GHSA-5j98-2g5x-46v6 , EUVD-2026-82939

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • crates.io hickory-resolver 0.26.2
  • hickory-dns hickory-resolver 0.26.2
  • rust-hickory-resolver Debian 14 0.26.3-1

debian advisories DEBIAN-CVE-2026-93657

  • rust-sequoia-sq RHEL 10.2 1.4.0.1-4.el10_2
  • sequoia-sq RHEL 10.2 1.4.0.1-4.el10_2

red hat advisories RHSA-2026:85848

  • openai-codex openSUSE Tumbleweed 0.158.0-1.1

opensuse advisories openSUSE-SU-2026:11923-1

  • sequoia-sq AlmaLinux 10 1.4.0.1-4.el10_2

almalinux advisories ALSA-2026:85848

  • rust-sequoia-sq Rocky Linux 10 1.4.0.1-4.el10_2

rocky linux advisories RLSA-2026:85848

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93657 updated cvss 7.5

hickory-resolver: hickory-resolver: DNSSEC validation bypass allows forged DNS records

  • Red Hat Enterprise Linux 9 rust-sequoia-sq 1.4.0.2-3.el9
    affected: workaround, no fix available
  • Red Hat Trusted Profile Analyzer rhtpa/rhtpa-rhel10, rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 10) sequoia-sq 1.4.0.1-4.el10_2, rust-sequoia-sq 1.4.0.1-4.el10_2
    fixed: vendor fix RHSA-2026:85848
  • Red Hat OpenShift AI 2.25 rhoai/odh-fms-guardrails-orchestrator-rhel9 1791535252
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.4 rhoai/odh-fms-guardrails-orchestrator-rhel9 1791862392
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-fms-guardrails-orchestrator-rhel9 1791947291
    fixed: vendor fix RHSA-2026:86891
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-ztunnel-rhel9 Red Hat Hardened Images rust 1.98.1-1.hum1, aardvark-dns 2.1.0-1.hum1, openshell 0.0.100-0.2.hum1 Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1792570619, rhoai/odh-vllm-cpu-rhel9 1792018436, rhoai/odh-dashboard-rhel9 1791853525, rhoai/odh-modelmesh-rhel9 1790881700, rhoai/odh-operator-bundle 1792571069, rhoai/odh-vllm-cuda-rhel9 1791358976, +65 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1791535789, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-trainer-rhel9 1791869783, +99 more Red Hat OpenShift AI 3.5 rhoai/odh-cli-rhel9 1791945905, rhoai/rhai-cli-rhel9 1791945905, rhoai/odh-automl-rhel9 1791916705, rhoai/odh-mlflow-rhel9 1791947857, rhoai/odh-autorag-rhel9 1791903266, rhoai/odh-trainer-rhel9 1791952138, +112 more Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
49 d ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
crates.io hickory-resolver
<0.26.2
0.26.2

Affected products

  • hickory-dns hickory-resolver

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.