Prosody up to 0.12.5/13.0.4 XML Parser allocation of resources

Summaryinfo

A vulnerability identified as problematic has been detected in Prosody up to 0.12.5/13.0.4. Affected is an unknown function of the component XML Parser. This manipulation causes allocation of resources. This vulnerability appears as CVE-2026-43507. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Prosody up to 0.12.5/13.0.4 and classified as problematic. Affected by this vulnerability is some unknown functionality of the component XML Parser. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at openwall.com. This vulnerability is known as CVE-2026-43507 since 05/01/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 311724 (Linux Distros Unpatched Vulnerability : CVE-2026-43507), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.12.6 or 13.0.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (311724). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Prosody

Version

• 0.12.0
• 0.12.1
• 0.12.2
• 0.12.3
• 0.12.4
• 0.12.5
• 13.0.0
• 13.0.1
• 13.0.2
• 13.0.3
• 13.0.4

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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