Insufficient verification of data authenticity in FreeBSD - CVE-2026-10846

Vulnerability identifier: #VU134361

CSH Severity: Medium

CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-10846

CWE-ID: CWE-345

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to spoof DNS responses and inject arbitrary DNS data.

The vulnerability exists due to improper response validation in the ldns stub resolver when processing UDP DNS responses. A remote attacker can send a spoofed UDP response to spoof DNS responses and inject arbitrary DNS data.

The issue affects ldns when used as a stub resolver over UDP and can be exploited by an off-path adversary that cannot observe the original query.

FreeBSD
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Basesystem Module
Development Tools Module
SUSE Package Hub 15
openSUSE Leap
Ubuntu
openEuler
Fedora
ldns (Ubuntu package)
ldns-help
python3-ldns
python2-ldns
perl-ldns
ldns-devel
ldns-debugsource
ldns-debuginfo
ldns
perl-DNS-LDNS-debuginfo
libldns2-debuginfo
perl-DNS-LDNS
libldns2
libldns3-debuginfo
python3-ldns-debuginfo
libldns3
lego

Install security update from vendor's website.

ldns (Ubuntu package) - addressed in versions 1.6.17-8ubuntu0.1+esm2, 1.7.0-3ubuntu4.1+esm1, 1.7.0-4.1ubuntu1+esm2, 1.7.1-2ubuntu4+esm2, 1.8.3-2ubuntu0.1~esm1, 1.8.4-2ubuntu0.26.04.1~esm1
ldns-help - update to 1.7.0-27
python3-ldns - update to 1.7.0-27
python2-ldns - update to 1.7.0-27
perl-ldns - update to 1.7.0-27
ldns-devel - update to 1.7.0-27
ldns-debugsource - update to 1.7.0-27
ldns-debuginfo - update to 1.7.0-27
ldns - update to 1.7.0-27
ldns-devel - addressed in versions 1.7.0-150000.4.11.1, 1.8.3-150600.3.3.1
perl-DNS-LDNS-debuginfo - addressed in versions 1.7.0-150000.4.11.1, 1.8.3-150600.3.3.1
libldns2-debuginfo - update to 1.7.0-150000.4.11.1
perl-DNS-LDNS - addressed in versions 1.7.0-150000.4.11.1, 1.8.3-150600.3.3.1
ldns-debuginfo - addressed in versions 1.7.0-150000.4.11.1, 1.8.3-150600.3.3.1
libldns2 - update to 1.7.0-150000.4.11.1
ldns-debugsource - addressed in versions 1.7.0-150000.4.11.1, 1.8.3-150600.3.3.1
libldns3-debuginfo - update to 1.8.3-150600.3.3.1
python3-ldns-debuginfo - update to 1.8.3-150600.3.3.1
ldns - update to 1.8.3-150600.3.3.1
python3-ldns - update to 1.8.3-150600.3.3.1
libldns3 - update to 1.8.3-150600.3.3.1
ldns - addressed in versions 1.9.2-1.fc43, 1.9.2-1.fc44
lego - addressed in versions 5.3.1-2.fc43, 5.3.1-2.fc44

• https://cgit.freebsd.org/src/commit/?id=20bfab98f8ae

• Multiple vulnerabilities in FreeBSD
• Fedora 44 update for ldns
• Fedora 43 update for ldns
• Ubuntu update for ldns
• SUSE update for ldns
• SUSE update for ldns
• openEuler update for ldns
• Fedora 44 update for lego
• Fedora 43 update for lego