Medium severity · published May 11, 2026
CVE-2026-42188
Geyser: Server-Side Request Forgery (SSRF) via Player Head Texture URL
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GE
Geyser · GeyserMC
< 2.9.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42188
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42188
Exploit
https://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r
More from Geyser
9.8
CVE-2021-39177
Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition