CVE-2026-31984
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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. 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA denial-of-service vulnerability exists in the audit logging functionality where unbounded resource allocation occurs due to a missing size limit on input recorded into audit entries. An unauthenticated attacker can submit requests containing excessively large input that gets written to audit logs, potentially exhausting disk space and rendering the system inoperable.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 26.2.0< 26.2.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify your installed product versionAccess the product admin interface or use the command-line interface to retrieve the version number. For CMC, typically found in the system information panel or via 'version' command. For Guardian, check the appliance management console or web UI footer.Affected if The version is below 26.2.0 (e.g., 26.1.x, 26.0.x, earlier releases)
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Verify audit logging is enabledCheck the product configuration settings. In the admin interface, navigate to System Settings > Logging or Audit Logs. Confirm the audit logging feature is turned on.Affected if Audit logging is enabled and the product version is below 26.2.0
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Confirm the product is accessible to unauthenticated network requestsReview network exposure settings. Determine if the web interface or API endpoints accept requests from unauthenticated or untrusted networks. Check firewall rules and access control lists.Affected if The product interface is reachable from untrusted networks without authentication barriers
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Examine audit log file sizes and growth patternsLocate audit log files (typically in /var/log/ or a dedicated logs directory within the product installation). Use 'ls -la' or similar to check file sizes. Monitor for unusually large files or rapid growth.Affected if Audit log files show abnormally large sizes or unexpected rapid growth without corresponding legitimate activity
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Check available disk space on log partitionsRun 'df -h' on the system to check disk space usage. Focus on partitions where audit logs are stored. Look for low available space or partitions approaching capacity.Affected if Disk space on log partitions is being consumed rapidly or is critically low, and audit logs are a primary contributor
You are likely affected if you are running Nozomi Networks CMC or Guardian below version 26.2.0, audit logging is enabled, and the product is accessible to unauthenticated attackers who could submit oversized requests.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped26.2.0
Implement input size limits on audit log entries (e.g., truncate or reject oversized input) and configure appropriate log rotation/retention policies to prevent disk exhaustion from this attack vector.
26.2.0 or later
- 1. Identify the current version of the affected product (CMC or Guardian) by checking the system information or version command.
- 2. Create a full backup of the system configuration and data, including database and audit logs, to ensure rollback capability.
- 3. Download the patched version 26.2.0 or later from the official vendor distribution channel (nozominetworks.com).
- 4. Follow the standard upgrade procedure documented in the product administration guide for your deployment mode (standalone or clustered).
- 5. After upgrade completion, verify the version number matches 26.2.0 or later.
- 6. Confirm audit logging functionality is operational and validate that input size limits are now enforced.
- 7. Monitor disk space utilization to confirm the mitigation is effective.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-31984 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-31984 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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