How severe is CVE-2026-10846?

CVE-2026-10846 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-10846 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-10846?

CVE-2026-10846 affects Nlnetlabs Ldns. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-10846?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-10846 have an EU (EUVD) identifier?

Yes. CVE-2026-10846 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35991.

When was CVE-2026-10846 published?

CVE-2026-10846 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-10846

CVE-2026-10846 is a high-severity vulnerability in Nlnetlabs Ldns with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.2
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35991
Weakness: CWE-346
Affected product: Nlnetlabs Ldns
Published: 2026-06-10
Last modified: 2026-06-17

Description

NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.

Frequently asked questions

What is CVE-2026-10846?: NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.
How severe is CVE-2026-10846?: CVE-2026-10846 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-10846 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-10846?: CVE-2026-10846 affects Nlnetlabs Ldns. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-10846?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-10846 have an EU (EUVD) identifier?: Yes. CVE-2026-10846 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35991.
When was CVE-2026-10846 published?: CVE-2026-10846 was published on 2026-06-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nlnetlabs:ldns:*:*:*:*:*:*:*:*

More vulnerabilities in Nlnetlabs Ldns

CVE-2017-1000232 — Critical (CVSS 9.8): A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors.
CVE-2017-1000231 — Critical (CVSS 9.8): A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors.
CVE-2020-19861 — High (CVSS 7.5): When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value…
CVE-2011-3581 — Medium (CVSS 6.8): Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers…
CVE-2020-19860 — Medium (CVSS 6.5): When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read…
CVE-2009-1086 — Medium (CVSS 6.4): Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause…

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