Cyber Resilience

CVE-2026-3593

HighUpdated

Published: 20 May 2026

Published
20 May 2026
Modified
30 June 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0184 76.4th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-3593 is a high-severity Use After Free (CWE-416) vulnerability in Isc Bind. Its CVSS base score is 7.4 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 23.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-416CWE-825

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Use-after-free in public-facing BIND DNS/DoH server directly enables remote exploitation of network service (T1190).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-5947Same product: Isc Bind
CVE-2026-3039Same product: Isc Bind
CVE-2026-3104Same product: Isc Bind
CVE-2026-1519Same product: Isc Bind
CVE-2026-5946Same product: Isc Bind
CVE-2026-45185Shared CWE-416
CVE-2026-41401Shared CWE-416
CVE-2024-45434Shared CWE-416
CVE-2025-70968Shared CWE-416
CVE-2026-6722Shared CWE-416

Affected Assets

isc
bind
9.20.0 — 9.20.23 · 9.21.0 — 9.21.22

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References