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High, CVSS 7.5amended

H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing

CVE-2024-7765GHSA-6w62-3jvj-mfj6

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI h2o

    Affected
    >= 3.32.1.2, <= 3.46.0.2
    Fixed in
    no fixed version recorded

  • Maven ai.h2o:h2o-core

    Affected
    >= 3.32.1.2, <= 3.46.0.2
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2024-7765: 0.78% estimated exploitation activity in the next 30 days; percentile 55.94 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-6w62-3jvj-mfj6

  2. Revision 1 · created ·

    Published from osv record GHSA-6w62-3jvj-mfj6

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-7765

Advisory: H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing
IDs: CVE-2024-7765, GHSA-6w62-3jvj-mfj6
Record: https://patchnext.com/advisories/cve-2024-7765 (revision 2, source checked 26 Oct 2026, 13:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI h2o: affected >= 3.32.1.2, <= 3.46.0.2
- Maven ai.h2o:h2o-core: affected >= 3.32.1.2, <= 3.46.0.2

## Suggested inspection (read-only)
- `python -m pip show h2o`: prints the installed version. Run with the environment that serves production active.
- Maven ai.h2o:h2o-core: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on h2o, ai.h2o:h2o-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6w62-3jvj-mfj6 (OSV record GHSA-6w62-3jvj-mfj6 lists affected ranges: PyPI h2o >=3.32.1.2 =3.32.1.2 <=3.46.0.2)
- Verified: https://github.com/advisories/GHSA-6w62-3jvj-mfj6 (GitHub-reviewed advisory GHSA-6w62-3jvj-mfj6 lists affected ranges: PyPI h2o >=3.32.1.2 =3.32.1.2 <=3.46.0.2)

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