---
id: CVE-2026-105941
title: >-
  Kroxylicious-kms-provider-azure-key-vault-kms: streams for apache kafka
  kroxylicious: azure key vault ssrf exfiltrates bearer token via untrusted edek
  vaultname
summary: >-
  The Azure Key Vault KMS provider in Kroxylicious accepts an untrusted
  vaultName from wire-deserialized EDEK bytes without format validation,
  enabling SSRF that exfiltrates the proxy's Azure bearer token to an
  attacker-controlled host. To…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: Red Hat
product: kroxylicious-kms-provider-azure-key-vault-kms
affected:
  - kroxylicious-kms-provider-azure-key-vault-kms (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-20T13:40:26.106666Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T13:40:36.464Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-105941'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-105941'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2510876'
    label: RHBZ#2510876
tags:
  - cve.org
ingestedAt: '2026-10-20T14:08:00.572Z'
---

## Overview

The Azure Key Vault KMS provider in Kroxylicious accepts an untrusted vaultName from wire-deserialized EDEK bytes without format validation, enabling SSRF that exfiltrates the proxy's Azure bearer token to an attacker-controlled host. Token replay against the real Key Vault defeats the entire record-encryption trust model.

## Affected

- `kroxylicious-kms-provider-azure-key-vault-kms (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

1. Bind all topics to KEKs — remove PASSTHROUGH_UNENCRYPTED as unresolvedKeyPolicy. Explicitly configure kekSelector to match every topic.
2. Restrict outbound network access — use Kubernetes NetworkPolicy to limit proxy pod egress to only legitimate Azure Key Vault endpoints on port 443.
3. Monitor KMS call patterns — alert on unwrap requests targeting unexpected vault hostnames.