CVE-2024-6863
Encryption of Arbitrary Files with Attacker-Controlled Key in h2oai/h2o-3
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Encryption of Arbitrary Files with Attacker-Controlled Key in h2oai/h2o-3
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.
- Record
CVE-2024-6863- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-749
- Updated
- 2026-11-02
EUVDEUVD-2025-6964
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.
- Record
EUVD-2025-6964- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m37h-8r48-2cxj
H2O Vulnerable to Execution of Arbitrary Files
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.
- Record
GHSA-m37h-8r48-2cxj- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-749
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2024-6863- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-749
- Updated
- 2026-11-02
OSVGHSA-m37h-8r48-2cxj
H2O Vulnerable to Execution of Arbitrary Files
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.
- Record
GHSA-m37h-8r48-2cxj- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-749
- Updated
- 2026-11-02
OSVPYSEC-2026-1442
H2O Vulnerable to Execution of Arbitrary Files
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.
- Record
PYSEC-2026-1442- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
h2oPyPI |
3.32.1.2 to 3.46.0 | None known |
ai.h2o:h2o-coreMaven |
3.32.1.2 to 3.46.0 | None known |
h2oPyPI |
3.32.1.2 to 3.46.0, plus listed versions 3.32.1.33.32.1.43.32.1.53.32.1.63.32.1.7 Show 26 moreShow less3.34.0.33.34.0.73.34.0.83.36.0.23.36.0.33.36.0.43.36.1.13.36.1.23.36.1.33.36.1.43.36.1.53.38.0.13.38.0.23.38.0.33.38.0.43.40.0.13.40.0.23.40.0.33.40.0.43.42.0.13.42.0.23.42.0.33.42.0.43.44.0.13.44.0.23.44.0.3 |
None known |
ai.h2o:h2o-coreMaven |
3.32.1.2 to 3.46.0, plus listed versions 3.32.1.33.32.1.43.32.1.53.32.1.63.32.1.7 Show 32 moreShow less3.34.0.13.34.0.33.34.0.43.34.0.53.34.0.63.34.0.73.34.0.83.35.0.23.36.0.13.36.0.23.36.0.33.36.0.43.36.1.13.36.1.23.36.1.33.36.1.43.36.1.53.38.0.13.38.0.23.38.0.33.38.0.43.40.0.13.40.0.23.40.0.33.40.0.43.42.0.13.42.0.23.42.0.33.42.0.43.44.0.13.44.0.23.44.0.3 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-6863 is a medium vulnerability (CVSS 6.5) in H2o, published March 20, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 29th percentile. No source names a fixed version.