Threat Intelligence / CVE / CVE-2026-3593

CVE-2026-3593

CVSS 7.4 (HIGH) · EPSS 0.0% · Published 2026-05-20

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Weaknesses (CWE)

CWE-416

Threats tracking this CVE

BIND 9 Multi-CVE Disclosure (May 2026) — Heap UAF in DoH (CVE-2026-3593), SIG(0) UAF (CVE-2026-5947), Resolver Resend Loop DoS (CVE-2026-5950), CLASS!=IN Assertion DoS (CVE-2026-5946), Glue Amplification (CVE-2026-3592), GSS-API TKEY Memory Exhaustion (CVE-2026-3039) — HIGH

References

https://kb.isc.org/docs/cve-2026-3593
https://downloads.isc.org/isc/bind9/9.20.23
https://downloads.isc.org/isc/bind9/9.21.22

Full detection coverage & IOCs for threats exploiting CVE-2026-3593 are available via the Threadlinqs MCP server (Purple tier). View plans →

Markdown version · Threadlinqs Intelligence