NN-2026:11-01
DoS through oversized audit log entries in Guardian/CMC before 26.2.0
Last update: 2026-07-07
| Advisory ID | NN-2026:11-01 |
|---|---|
| Topic | DoS through oversized audit log entries in Guardian/CMC before 26.2.0 |
| CWE Impact | CWE-770: Allocation of Resources Without Limits or Throttling |
| Issue date | 2026-07-07 |
| Affects | Guardian, CMC < v26.2.0 |
| CVE Name(s) | CVE-2026-31984 |
| CVSS Details | 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 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CVSS Score | 8.7 (CVSS v4.0) 7.5 (CVSS v3.1) |
| CVE Risk Level | High (CVSS v4.0) High (CVSS v3.1) |
| Risk Level for Nozomi customers | High |
Summary
A denial-of-service vulnerability caused by unbounded resource allocation was discovered in the audit logging functionality, due to a missing size limit on input recorded into audit entries.
Impact
An unauthenticated attacker can submit requests containing excessively large input that is recorded into audit entries, possibly exhausting the available disk space and rendering the system inoperable.
Affected Products
Guardian, CMC < v26.2.0
Workarounds and Mitigations
Use internal firewall features to limit access to the web management interface.
Solutions
Upgrade to v26.2.0 or later.
Modification History
2026-07-07: Initial revision
Related Links
Acknowledgements
We thank the following parties for their efforts:
- Andrea Palanca of Nozomi Networks Product Security team for finding this issue during an internal investigation
Contact
Nozomi Networks Product Security team can be reached at prodsec@nozominetworks.com.More contact details on the PSIRT page.