How severe is CVE-2026-40719?

CVE-2026-40719 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 none, and availability high.

Is CVE-2026-40719 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40719?

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-2026-40719 have an EU (EUVD) identifier?

Yes. CVE-2026-40719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22839.

When was CVE-2026-40719 published?

CVE-2026-40719 was published on 2026-04-15 and last updated on 2026-06-17.

CVE-2026-40719

CVE-2026-40719 is a high-severity vulnerability 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-670.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22839
Weakness: CWE-670
Published: 2026-04-15
Last modified: 2026-06-17

Description

Deadwood in MaraDNS 3.5.0036 allows attackers to exhaust connection slots via a zone whose authoritative nameserver address cannot be resolved.

Frequently asked questions

What is CVE-2026-40719?: Deadwood in MaraDNS 3.5.0036 allows attackers to exhaust connection slots via a zone whose authoritative nameserver address cannot be resolved.
How severe is CVE-2026-40719?: CVE-2026-40719 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 none, and availability high.
Is CVE-2026-40719 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40719?: 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-2026-40719 have an EU (EUVD) identifier?: Yes. CVE-2026-40719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22839.
When was CVE-2026-40719 published?: CVE-2026-40719 was published on 2026-04-15 and last updated on 2026-06-17.

References

Other CWE-670 vulnerabilities

CVE-2025-43359 — Critical (CVSS 9.8): A logic issue was addressed with improved state management. This issue is fixed in iOS 18.7 and iPadOS 18.7, iOS 26 and…
CVE-2022-25745 — Critical (CVSS 9.8): Memory corruption in modem due to improper input validation while handling the incoming CoAP message
CVE-2020-1914 — Critical (CVSS 9.8): A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit…
CVE-2020-17466 — Critical (CVSS 9.8): Turcom TRCwifiZone through 2020-08-10 allows authentication bypass by visiting manage/control.php and ignoring 302…
CVE-2019-17192 — Critical (CVSS 9.8): The WebRTC component in the Signal Private Messenger application through 4.47.7 for Android processes videoconferencing…
CVE-2026-55276 — Critical (CVSS 9.1): Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty…

Browse all CWE-670 vulnerabilities →