Predictable Seed in Pseudo-Random Number Generator (PRNG) in CoreDNS - CVE-2026-26018
Published: March 6, 2026
Vulnerability identifier: #VU123610
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-2026-26018
CWE-ID: CWE-337
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to usage of predictable pseudo-random number generator (PRNG) for generating a secret query name combined with a fatal error handler. A remote attacker can send specially crafted DNS queries to the server and perform a denial of service attack.
Affected software
CoreDNS
openEuler
coredns
coredns-help
openEuler
coredns
coredns-help
How to mitigate CVE-2026-26018
Install updates from vendor's website.
CoreDNS - update to 1.14.2
coredns - update to 1.7.0-1.7
coredns-help - update to 1.7.0-1.7
coredns - update to 1.7.0-1.7
coredns-help - update to 1.7.0-1.7