CVE-2026-54617

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Source

https://cve.org/CVERecord?id=CVE-2026-54617

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54617.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-54617

Aliases

GHSA-5g75-477j-2c2f

Published

2026-09-17T18:34:40Z

Modified

2026-10-28T11:09:57Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

GravitLauncher: Unauthenticated path traversal in LaunchServer FileServerHandler

Details

GravitLauncher is an open-source Minecraft launcher based on sashok724's v3. Prior to 5.7.12, an unauthenticated remote actor can send a raw HTTP request target without a leading slash to the default LaunchServer file server on port 9274. FileServerHandler.channelRead0 in components/launchserver/src/main/java/pro/gravit/launchserver/socket/handlers/fileserver/FileServerHandler.java strips the first request-target character and resolves the remaining path against updatesDir without re-normalizing and verifying containment. This leaves parent-directory components in a no-leading-slash request and allows reading any file accessible to the LaunchServer process, including .keys/ecdsa_id, .keys/legacySalt, and LaunchServer.json. Disclosure of those files can expose signing keys, refresh-token material, and database credentials, enabling forged administrative access tokens and full authentication bypass. A normalizing L7 proxy may block the primary request form, but direct exposure and L4/TCP proxies remain affected, and netty.fileServerEnabled is enabled by default. This issue is fixed in 5.7.12.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-200",
        "CWE-22",
        "CWE-522"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54617.json"
}

References

Affected packages

Git / github.com/gravitlauncher/launcher

Affected ranges

Type

GIT

Repo

https://github.com/gravitlauncher/launcher

Events

Introduced

Fixed

fef9bae63da1afc0518d32e3333db20f409ab196

Fixed

8114a1d4cfbcaab4c1c337d921597805d71dee3b

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "5.7.12"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "8114a1d4cfbcaab4c1c337d921597805d71dee3b"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v5.7.12",
            "range":  [
                {
                    "fixed":  "fef9bae63da1afc0518d32e3333db20f409ab196"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v4.*

v4.0.0b1-dev

v4.0.0b2-dev

v4.0.0b3-dev

v4.0.1-beta

v4.0.2-beta

v4.0.6-beta

v4.0.7-stable

v4.0.8-stable

v4.1.0b7-beta

v4.1.0b8-beta

v4.2.1-stable

v5.*

v5.0.0b4

v5.2.0-stable

v5.2.2

v5.2.6

v5.7.1b3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54617.json"

vanir_signatures

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    {
        "deprecated":  false,
        "digest":  {
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            "length":  2427
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        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/gravitlauncher/launcher/commit/8114a1d4cfbcaab4c1c337d921597805d71dee3b",
        "target":  {
            "file":  "components/launchserver/src/main/java/pro/gravit/launchserver/socket/handlers/fileserver/FileServerHandler.java",
            "function":  "channelRead0"
        }
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        "source":  "https://github.com/gravitlauncher/launcher/commit/8114a1d4cfbcaab4c1c337d921597805d71dee3b",
        "target":  {
            "file":  "components/launchserver/src/main/java/pro/gravit/launchserver/socket/handlers/fileserver/FileServerHandler.java"
        }
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        "signature_version":  "v1",
        "source":  "https://github.com/gravitlauncher/launcher/commit/fef9bae63da1afc0518d32e3333db20f409ab196",
        "target":  {
            "file":  "components/launcher-core/src/main/java/pro/gravit/utils/Version.java"
        }
    }
]

vanir_signatures_modified

"2026-10-28T11:09:57Z"