What’s Vulnerable › Vulnerabilities
CVE-2024-5986: Remote Arbitrary File Write with Arbitrary Data in h2oai/h2o-3
- Severity: critical (CVSS 9.1 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-02 · updated 2026-06-17
- Weakness: CWE-73
Description
A vulnerability in h2oai/h2o-3 version 3.46.0.1 allows remote attackers to write arbitrary data to any file on the server. This is achieved by exploiting the `/3/Parse` endpoint to inject attacker-controlled data as the header of an empty file, which is then exported using the `/3/Frames/framename/export` endpoint. The impact of this vulnerability includes the potential for remote code execution and complete access to the system running h2o-3, as attackers can overwrite critical files such as private SSH keys or script files.
Affected products
- h2oai/h2o-3: through latest
References
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