DNS
CVE-2026-27831
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionGitHub Advisory
rldns is an open source DNS server. Version 1.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue.
AnalysisAI
Heap buffer over-read vulnerability in rldns DNS server version 1.3 allows remote attackers to trigger denial of service without authentication or user interaction. The flaw enables reading beyond allocated memory boundaries, causing the service to crash. Version 1.4 addresses this issue, though no patch is currently available for affected 1.3 deployments.
Technical ContextAI
Classified as CWE-125 (Out-of-bounds Read). rldns is an open source DNS server. Version 1.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue.
Affected ProductsAI
rldns is an open source DNS server
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Heap Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today