CVE-2026-86202VulnerabilityPublished 09/09/2026Updated 10/08/2026

CVE-2026-86202: Insufficient Control of Network Message Volume (Network Amplification) in pmmp PocketMine-MP

Affects pmmp PocketMine-MPSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium · fixed in 5.39.2 : update pmmp PocketMine-MP when convenient.

Data as of 10/25/2026, 04:40:14 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Exploitation: Not in CISA KEV, no exploitation reported
EPSS: 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.39.2

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

What to do

Affected software

Product	Affected	Fixed in
pmmpPocketMine-MP	Affected <5.39.2	Fixed in 5.39.2
GitHubpmmp/PocketMine-MP`pkg:github/pmmp/PocketMine-MP`Other threats	Affected <5.39.2	Fixed in 5.39.2

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AI-suggested

A fix is available in PocketMine-MP version 5.39.2. Users should upgrade to version 5.39.2 or later to remediate this vulnerability. No additional mitigation steps are indicated.

Description

CVE-2026-86202 is a medium severity vulnerability in PocketMine-MP before version 5.39.2. It involves insufficient control of network message volume in the handling of ActorEventPacket messages. Attackers can exploit this to trigger consuming animations for all visible players, causing network amplification that wastes server CPU and memory resources.

Impact

Exploitation of this vulnerability allows an attacker with limited privileges to cause resource exhaustion on the server by triggering excessive animation events. This can degrade server performance and potentially disrupt service availability due to wasted CPU and memory resources. There is no indication of direct code execution or data compromise.

Summary

PocketMine-MP versions prior to 5.39.2 contain a network amplification vulnerability in the ActorEventPacket processing. Specifically, crafted ActorEventPacket messages can be sent by clients to cause the server to broadcast excessive animation events to other clients. This results in amplified network traffic and increased consumption of server CPU and memory, potentially degrading server performance.

References

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