Overview
The Common Vulnerabilities and Exposures (CVE) system has recently identified a critical vulnerability labeled CVE-2025-32947. This flaw primarily affects the PeerTube server, exposing it to potential system compromise or data leakage. The vulnerability, if exploited, results in the server entering an infinite loop, thus rendering it unresponsive to further requests. Given the severity of this issue, it requires immediate attention and remediation.
Vulnerability Summary
CVE ID: CVE-2025-32947
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or potential data leakage
Affected Products
Product | Affected Versions
PeerTube Server | All versions up to latest
How the Exploit Works
The exploit takes advantage of a flaw in the “inbox” endpoint of the PeerTube server. By sending a specifically crafted ActivityPub activity, an attacker can trigger an infinite loop within the server. This loop causes the server to halt all other operations and stop responding to requests, effectively causing a denial of service. It may also expose the system to potential data leakage or compromise.
Conceptual Example Code
This conceptual example illustrates a potential malicious request that could exploit this vulnerability:
POST /inbox HTTP/1.1
Host: peertube.example.com
Content-Type: application/activity+json
{
"@context": "https://www.w3.org/ns/activitystreams",
"type": "Note",
"content": "This is a crafted ActivityPub activity that causes infinite loop..."
}
In the above request, the “content” field contains a malicious payload designed to exploit the flaw in the “inbox” endpoint.
Mitigation Guidance
The recommended mitigation for this vulnerability is to apply the patch provided by the vendor as soon as it becomes available. For immediate but temporary relief, utilizing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help mitigate the vulnerability by blocking malicious activities aimed at exploiting this flaw.
