Vulnerability · Published May 11, 2026 · Assigned by GitHub_M
CVE-2026-42188Geyser: Server-Side Request Forgery (SSRF) via Player Head Texture URL
Low 2.4
In plain English
A low-severity server-side request forgery in Geyser from GeyserMC. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Prior to 2.9.3, a server-side request forgery (SSRF) vulnerability exists in Geyser’s handling of Bedrock player head texture data. By supplying a crafted Base64-encoded skin texture URL via the /give command, an attacker can cause the Minecraft server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side, without proper URL validation, and can be triggered by a Bedrock client. This vulnerability is fixed in 2.9.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.geysermc.geyser:core | 2.9.3 | GHSA-xcfg-fcr5-gw9r |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N
References
- https://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r x_refsource_CONFIRM