DoS through oversized audit log entries in Guardian/CMC before 26.2.0 (CVE-2026-31984) | HOL Guard CVE

High · CVSS 7.5CVE-2026-31984

DoS through oversized audit log entries in Guardian/CMC before 26.2.0

Answer in brief

CVE-2026-31984 records a High severity (CVSS 7.5) vulnerability in DoS through oversized audit log entries in Guardian/CMC before 26.2.0. The current sources do not mark it as known exploited. The current feed maps Nozomi Networks/CMC (generic), Nozomi Networks/Guardian (generic), Siemens/RUGGEDCOM APE1808 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 9, 2026Updated Aug 11, 2026Source checked Sep 22, 2026First seen by HOL Jul 9, 2026Material review Aug 11, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 5 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Nozomi Networks/CMC (generic), Nozomi Networks/Guardian (generic), Siemens/RUGGEDCOM APE1808 (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:nozominetworks:cmc::::::::	Not reported	Not reported
cpe:2.3:a:nozominetworks:guardian::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Nozomi Networks/CMCgeneric	>=0 <26.2.0	26.2.0
Nozomi Networks/Guardiangeneric	>=0 <26.2.0	26.2.0
Siemens/RUGGEDCOM APE1808generic	>=0 <*	*

Recommended response

Check inventory. Check lockfiles and deployed manifests for Nozomi Networks/CMC, Nozomi Networks/Guardian, Siemens/RUGGEDCOM APE1808.
Review the reported fix. Update Nozomi Networks/CMC to 26.2.0; Nozomi Networks/Guardian to 26.2.0; Siemens/RUGGEDCOM APE1808 to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 9, 2026

Sources and claim methodology

Upstream source description

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. 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.

Quoted source text, attributed separately from HOL analysis.