Bug 2479770 (CVE-2026-3593)

Summary:	CVE-2026-3593 bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, security-response-team, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the BIND (Berkeley Internet Name Domain) DNS-over-HTTPS implementation. A remote attacker could send specially crafted HTTP/2 traffic to a DNS-over-HTTPS endpoint, leading to a use-after-free vulnerability. This could trigger memory corruption, potentially allowing the attacker to cause a denial of service or, in some cases, execute arbitrary code.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2480121, 2481341, 2481343
Bug Blocks:

Description OSIDB Bzimport 2026-05-19 09:58:00 UTC

Description:

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

Impact:

Crafted HTTP/2 traffic sent to a DNS-over-HTTPS endpoint can be used to trigger memory corruption.

-   Authoritative servers are affected by this vulnerability.

-   Resolvers are affected by this vulnerability.