EUVD-2026-74911
GHSA-h5mw-4vcp-gq3w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable pre-authentication with no complexity; impact is partial availability degradation only, no confidentiality or integrity loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
PocketMine-MP versions before 5.42.1 contain a denial of service vulnerability in the LoginPacket handler that allows remote attackers to flood warning messages by injecting numerous junk properties into the clientData JWT. Attackers can craft malicious login packets with excessive unknown properties to waste server CPU time and degrade performance.
AnalysisAI
Remote denial-of-service in PocketMine-MP before 5.42.1 allows unauthenticated network attackers to degrade server performance by sending LoginPackets whose clientData JWT bodies contain large numbers of arbitrary junk properties. The server's JsonMapper iterates over and logs a warning for every unexpected property, enabling log flooding and unbounded CPU waste with no authentication required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication, configuration change, or special client state is required: any host that can reach the server's Bedrock network port (default UDP 19132) can send a pre-authentication LoginPacket. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L) scores 6.9, reflecting no authentication requirement and no confidentiality or integrity impact, with only low availability degradation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade PocketMine-MP to version 5.42.1 or later; this is the vendor-confirmed fix, implemented in commit c1d4a813fb8c21bfd8b9affd040da864b794df71, which limits the number of tolerated unknown JWT properties to 10 and rejects the LoginPacket by throwing a PacketHandlingException when this threshold is exceeded. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-779 – Logging of Excessive Data
View allSame technique Denial Of Service
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External POC / Exploit Code
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