Kiteworks Email Protection Gateway Deserialization of Untrusted Data (CVE-2026-102135) | HOL Guard CVE

Medium · CVSS 6.6CVE-2026-102135

Kiteworks Email Protection Gateway Deserialization of Untrusted Data

Answer in brief

CVE-2026-102135 records a Medium severity (CVSS 6.6) vulnerability in Kiteworks Email Protection Gateway Deserialization of Untrusted Data. The current sources do not mark it as known exploited. The current feed maps Kiteworks/Email Protection Gateway (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 Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.6. 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 Kiteworks/Email Protection Gateway (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Kiteworks/Email Protection Gatewaygeneric	>=0 <9.5.1	9.5.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for Kiteworks/Email Protection Gateway.
Review the reported fix. Update Kiteworks/Email Protection Gateway to 9.5.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source description

On a Kiteworks Email Protection Gateway cluster with database replication enabled, a party trusted by the cluster could submit a crafted serialized object that was deserialized without sufficient validation, potentially allowing code execution as the gateway service account. Replication is disabled by default, and exploitation requires control of a trusted cluster peer or administrative access to the appliance.

Quoted source text, attributed separately from HOL analysis.