CVE-2026-42188: Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition

Q: How do I fix CVE-2026-42188?

geyser: upgrade to 2.9.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-42188 being exploited?

CVE-2026-42188 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42188 affect?

CVE-2026-42188 affects geyser. Severity is low (CVSS 2.4). 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 Ba

Q: How urgent is CVE-2026-42188?

Priority 16/100. Public exploit reference

Routine

LOW 2.4UPGRADE

CVE-2026-42188 is a low-severity flaw (CVSS 2.4) affecting geyser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, withou

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.4 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-11
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: geysermc

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 22:22 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

geysermc geyser UPGRADE

Affected: < 2.9.3

Fixed in: 2.9.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy geyser || rpm -q geyser || geyser --version

2. UPGRADE to 2.9.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade geyser

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade geyser

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42188?

geyser: upgrade to 2.9.3. Exact commands for each OS are on this page.

Is CVE-2026-42188 being exploited?

CVE-2026-42188 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42188 affect?

CVE-2026-42188 affects geyser. Severity is low (CVSS 2.4). 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 Ba

How urgent is CVE-2026-42188?

Priority 16/100. Public exploit reference

Software pages

Java vulnerabilities

References

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