CVE-2026-43507 — Prosody Denial of Service
CVE-2026-43507 — An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5. A Denial of Service can occur via memory exhaustion caused by XML parsing resource amplification from unauthenticated connections.
What This Means For You
- If your environment is affected by CWE-770, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-43507 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-43507 - Prosody XML Resource Amplification DoS
title: CVE-2026-43507 - Prosody XML Resource Amplification DoS
id: scw-2026-05-01-ai-1
status: experimental
level: medium
description: |
Detects potential exploitation of CVE-2026-43507 by looking for POST requests to an XMPP-related endpoint that results in a server error (500), indicative of a resource exhaustion denial of service attack via XML parsing amplification. This rule targets the specific vulnerability in Prosody's XML handling.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-43507/
tags:
- attack.impact
- attack.t1499
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/xmpp-server/'
cs-method|exact:
- 'POST'
sc-status|exact:
- '500'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-43507 | vulnerability | CVE-2026-43507 |
| CWE-770 | weakness | CWE-770 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 01, 2026 at 18:16 UTC |
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