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Fencer Vulns
medium 6.2

CVE-2026-35406 json

Aardvark-dns has incorrect error handling for malformed tcp packets

published 2026-04-07 7 mo ago modified 2026-07-24 3 mo ago also GHSA-hfpq-x728-986j , EUVD-2026-19972

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Aardvark-dns is an authoritative dns server for A/AAAA container records. From 1.16.0 to 1.17.0, a truncated TCP DNS query followed by a connection reset causes aardvark-dns to enter an unrecoverable infinite error loop at 100% CPU. This vulnerability is fixed in 1.17.1.

Patch / fix

  • crates.io netavark 1.17.1
  • containers aardvark-dns 1.17.1
  • aardvark-dns Debian 14 1.16.0-3

debian advisories DEBIAN-CVE-2026-35406

  • aardvark-dns hummingbird 1 2.1.0-1.hum1
  • aardvark-dns-tests hummingbird 1 2.1.0-1.hum1
  • aardvark-dns RHEL 10.2 2:1.17.1-1.el10_2
  • aardvark-dns RHEL 9 2:1.17.1-1.el9_8

red hat advisories RHSA-2026:56999RHSA-2026:36782RHSA-2026:36318

  • aardvark-dns openSUSE Tumbleweed 1.17.1-1.1

opensuse advisories openSUSE-SU-2026:10570-1

  • aardvark-dns AlmaLinux 10 2:1.17.1-1.el10_2
  • aardvark-dns AlmaLinux 9 2:1.17.1-1.el9_8

almalinux advisories ALSA-2026:36782ALSA-2026:36318

  • aardvark-dns Rocky Linux 10 2:1.17.1-1.el10_2
  • aardvark-dns Rocky Linux 9 2:1.17.1-1.el9_8

rocky linux advisories RLSA-2026:36782RLSA-2026:36318

  • aardvark-dns Alpine 3.24 1.17.1-r0

alpine advisories ALPINE-CVE-2026-35406

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-35406 updated cvss 6.5

aardvark-dns: Aardvark-dns: Denial of Service via truncated TCP DNS query and connection reset

  • Red Hat Enterprise Linux 8 aardvark-dns
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) aardvark-dns 1.17.1-1.el9_8
    fixed: vendor fix RHSA-2026:36318
  • Red Hat Enterprise Linux AppStream (v. 10) aardvark-dns 1.17.1-1.el10_2
    fixed: vendor fix RHSA-2026:36782
  • Red Hat Hardened Images aardvark-dns 2.1.0-1.hum1, aardvark-dns-tests 2.1.0-1.hum1
    fixed: vendor fix RHSA-2026:56999
  • Red Hat Enterprise Linux 8 netavark, containers-common Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9
    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
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io netavark
>=1.16.0, <1.17.1
1.17.1

Affected products

  • containers aardvark-dns

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-835 Loop with Unreachable Exit Condition

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.