Double free in dnsdist - CVE-2025-30194

Vulnerability identifier: #VU108042

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-30194

CWE-ID: CWE-415

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a double free error when DNSdist is configured to provide DoH via the nghttp2 provider. A remote attacker can initiate a crafted DoH exchange that triggers an illegal memory access and perform a denial of service (DoS) attack.

dnsdist
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Basesystem Module
Fedora
dnsdist
dnsdist-debuginfo
dnsdist-debugsource

Install updates from vendor's website.

dnsdist - update to 1.9.9
dnsdist - addressed in versions 1.9.9-1.fc40, 1.9.9-1.fc41, 1.9.9-1.fc42
dnsdist-debuginfo - update to 1.9.10-150700.3.3.1
dnsdist-debugsource - update to 1.9.10-150700.3.3.1
dnsdist - update to 1.9.10-150700.3.3.1

• https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html

• Remote denial of service in PowerDNS DNSdist
• Fedora 40 update for dnsdist
• Fedora 41 update for dnsdist
• Fedora 42 update for dnsdist
• SUSE update for dnsdist