CVE-2023-54396Public exploitNetwork attack vector

Authenticated server crash via invalid banner colors

Published Sep 9, 2026 · Updated Sep 9, 2026

Improper array-index validation in PMMP PocketMine-MP before 4.8.1 allows remote authenticated users to crash the server via banner NBT. DyeColorIdMap::fromId directly indexes its ID map with an unvalidated pattern-color value while Banner::deserializeCompoundTag processes item NBT. A logged-in player can reach the path through an inventory transaction; the resulting undefined offset terminates the server without reported data disclosure or modification.

CVSS severity7.1
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in PMMP PocketMine-MP before 4.8.1 allows remote authenticated users to crash the server via banner NBT. DyeColorIdMap::fromId directly indexes its ID map with an unvalidated pattern-color value while Banner::deserializeCompoundTag processes item NBT. A logged-in player can reach the path through an inventory transaction; the resulting undefined offset terminates the server without reported data disclosure or modification.

The record

CVE
CVE-2023-54396
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
PMMP
Product
PocketMine-MP
Classifications
CWE-129, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PMMP · PocketMine-MPversion=0 <4.8.1

Published CVSS scores

6.5PMMPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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