High severity7.4NVD Advisory· Published May 20, 2026· Updated May 21, 2026
CVE-2026-3593
CVE-2026-3593
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6- osv-coords3 versionspkg:rpm/opensuse/bind&distro=openSUSE%20Tumbleweedpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 9.20.23-2.1+ 2 more
- (no CPE)range: < 9.20.23-2.1
- (no CPE)range: < 9.20.23-160000.1.1
- (no CPE)range: < 9.20.23-160000.1.1
Patches
Vulnerability mechanics
References
3- downloads.isc.org/isc/bind9/9.20.23nvdPatch
- downloads.isc.org/isc/bind9/9.21.22nvdPatch
- kb.isc.org/docs/cve-2026-3593nvdVendor Advisory
News mentions
2- ⚡ Weekly Recap: New Linux Flaw, PAN-OS Exploit, AI-Powered Attacks, OAuth Phishing and MoreThe Hacker News · Jun 1, 2026
- BIND 9 Software Vulnerabilities Exposes Resolvers and Authoritative Servers to Remote ExploitsCyber Security News · May 27, 2026