CVE-2026-96405
Aggregate DNS name chained pointer decompression work leads to degradation of service.
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 21, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 14, 2026
Description
NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message results in a lot of CPU usage following them. A malicious actor with recursive-query access and control of an ordinarily delegated authority that serves specially crafted replies can exploit the vulnerability and degrade Unbound's general performance.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | NLnet Labs |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
UnboundNLnet Labs |
|
References
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