What’s Vulnerable › Vulnerabilities

CVE-2026-27831: rldns Vulnerable to Heap-based Out-of-Bounds Read

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-26 · updated 2026-06-17
• Weakness: CWE-125

Description

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 products

• bluedragonsecurity rldns: = 1.3

References

• https://github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-in-rldns-1.4
• https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4
• https://github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff
• https://medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3bccdc031
• https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4

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