MEDIUM6.5
PYSEC-2026-1442
H2O Vulnerable to Execution of Arbitrary Files
Details
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI/h2o
Introduced in:
3.32.1.2No fixed version published yet for h2o (pip). Pin to a known-safe version or switch to an alternative.
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-6863[ADVISORY]
- https://github.com/h2oai/h2o-3[PACKAGE]
- https://github.com/h2oai/h2o-3/blob/a20b5b19b769866ee24b217ee78b820e64c1cd6a/h2o-core/src/main/java/water/tools/EncryptionTool.java#L49[WEB]
- https://huntr.com/bounties/10f55937-0cba-4530-897f-2abf30ed5270[WEB]
- https://pypi.org/project/h2o[PACKAGE]
- https://github.com/advisories/GHSA-m37h-8r48-2cxj[ADVISORY]