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Advisory record · GHSA-xcfg-fcr5-gw9r

Geyser Vulnerable to Server-Side Request Forgery (SSRF) via Player Head Texture URL in Geyser

CVSS 2.4 LowEPSS 0.0019 · 9th percentile

Published by the GitHub Advisory Database at 5 May 2026, 20:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.geysermc.geyser:coreMaven<2.9.32.9.3
Identifiers
GHSA-xcfg-fcr5-gw9r · CVE-2026-42188
Weakness (CWE)
CWE-918
Tags
Published
5 May 2026
Updated
13 May 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Geyser core versions before 2.9.3 are vulnerable to server-side request forgery through the handling of player head texture data. An attacker connected as a Bedrock client with permission to use the /give command can supply a crafted skin texture URL, which makes the Minecraft server send HTTP GET requests to arbitrary endpoints, including internal ones. The source describes this as blind SSRF, with no response returned to the attacker. Upgrade to Geyser core 2.9.3 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.4 Low 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0019, the 9th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.