Out-of-bounds read in dnsdist - CVE-2026-33598
Published: April 23, 2026
Vulnerability identifier: #VU126948
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33598
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
dnsdist
dnsdist
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in packet cache inspection via Lua when custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a cached crafted response. A remote attacker can supply a crafted response that is cached to disclose sensitive information.
Exploitation requires custom Lua code to call getDomainListByAddress() or getAddressListByDomain() on a packet cache.
How to mitigate CVE-2026-33598
Install security update from vendor's website.