Is CVE-2026-3593 actively exploited?

No active exploitation of CVE-2026-3593 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3593 be exploited remotely?

Yes. CVE-2026-3593 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-3593?

CVE-2026-3593 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-3593

CWE-416Published: May 20, 2026· Updated: May 21, 2026

9.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official Description

A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.

This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1.

BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.

NVD Source

Technical Analysis

CVE-2026-3593 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.