Use-after-free in ISC BIND - CVE-2026-3593
Published: May 22, 2026
Vulnerability identifier: #VU132117
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-3593
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ISC
Affected software:
ISC BIND
ISC BIND
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to use-after-free in the DNS-over-HTTPS implementation when processing crafted HTTP/2 traffic sent to a DNS-over-HTTPS endpoint. A remote attacker can send crafted HTTP/2 traffic to disclose sensitive information and cause a denial of service.
Both authoritative servers and resolvers are affected.
How to mitigate CVE-2026-3593
Install security update from vendor's website.