Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M
CVE-2026-27831rldns Vulnerable to Heap-based Out-of-Bounds Read
High 7.5
In plain English
A high-severity out-of-bounds read in rldns from bluedragonsecurity. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 57.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| bluedragonsecurity | rldns | = 1.3 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/bluedragonsecurity/rldns/security/advisories/GHSA-fv38-45j4-g9x4 x_refsource_CONFIRM
- https://github.com/bluedragonsecurity/rldns-1.3-heap-out-of-bounds-vulnerability-fixed-in-rldns-1.4 x_refsource_MISC
- https://github.com/bluedragonsecurity/rldns_archives/blob/main/diff/rldns-1.4.diff x_refsource_MISC
- https://medium.com/@w1sdom/heap-based-buffer-over-read-vulnerability-in-rldns-1-3-5da3bccdc031 x_refsource_MISC