What is CVE-2023-54355?

CVE-2023-54355 is a high-severity vulnerability in Pmmp Pocketmine-Mp, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-09.

How severe is CVE-2023-54355?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Pmmp Pocketmine-Mp

CVE-2023-54355

PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.

Published 2026-09-09 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.5th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Pmmp Pocketmine-Mp

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-79rc-jjh6-rc89 (vendor-advisory)
github.com/pmmp/PocketMine-MP/commit/4e646d19a4a1e0d082bd4d1f5a58ae0182a268d9 (patch)
www.vulncheck.com/advisories/pocketmine-mp-5.2.0-server-crash-via-incorrect-ec-… (third-party-advisory)

Frequently asked questions

What is CVE-2023-54355?: CVE-2023-54355 is a high-severity vulnerability in Pmmp Pocketmine-Mp, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-09.
How severe is CVE-2023-54355?: High severity. CVSS v3 base score is 7.5 out of 10.