CVE-2025-10768: A flaw has been found in h2oai h2o-3 up to 3.46.08

Routine

MEDIUM 6.3UPGRADE

CVE-2025-10768 is a medium-severity flaw (CVSS 6.3) affecting h2o. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in h2oai h2o-3 up to 3.46.08. The impacted element is an unknown function of the file /99/ImportSQLTable of the component IBMDB2 JDBC Driver. This manipulation of the argument connection_url causes deserialization. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-20, CWE-502
Published	2025-09-21
Last modified	2026-09-30

Publisher (CNA): VulDB · Vendor: h2o

Last updated 2026-09-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-21 10:15 UTCPublished CVE record published
2026-09-30 23:10 UTCUpdated Record last modified

h2o h2o UPGRADE

Affected: >= 3.0.0.2 and <= 3.46.0.8

Fixed in: newer than 3.46.0.8

Safe to downgrade to: a release before 3.0.0.2

1. Check installed version

apt-cache policy h2o || rpm -q h2o || h2o --version

2. UPGRADE to newer than 3.46.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade h2o

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade h2o

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.0.0.2 (Debian / Ubuntu)

apt-cache madison h2o sudo apt install h2o=<VERSION_BEFORE_3.0.0.2> sudo apt-mark hold h2o

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list h2o sudo dnf downgrade h2o-<VERSION_BEFORE_3.0.0.2> sudo dnf versionlock add h2o

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-10768?

h2o: upgrade to newer than 3.46.0.8. Exact commands for each OS are on this page.

Is CVE-2025-10768 being exploited?

CVE-2025-10768 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-2025-10768 affect?

CVE-2025-10768 affects h2o. Severity is medium (CVSS 6.3). A flaw has been found in h2oai h2o-3 up to 3.46.08. The impacted element is an unknown function of the file /99/ImportSQLTable of the component IBMDB2 JDBC Driver. This manipulation of the argument connection_url causes deserialization. The

How urgent is CVE-2025-10768?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2026-3960 CRITICAL 9.8 UPGRADE A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTa
CVE-2026-8751 HIGH 7.3 UPGRADE A security flaw has been discovered in h2oai h2o-3 up to 7402
CVE-2026-8750 MEDIUM 5.3 UPGRADE A vulnerability was identified in h2oai h2o-3 up to 7402
CVE-2026-8752 MEDIUM 5.3 UPGRADE A weakness has been identified in h2oai h2o-3 up to 7402
CVE-2025-6544 CRITICAL 9.8 UPGRADE A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitra

References

← Back to latest CVEs