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High, CVSS 7.5

SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine

CVE-2025-24970GHSA-4g8c-wm8x-jfhw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.netty:netty-handler 4.1.118.Final), redeploy, then verify what is actually installed.

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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2025-24970: 2.19% estimated exploitation activity in the next 30 days; percentile 82.47 (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.

Impact When a special crafted packet is received via SslHandler it doesn't correctly handle validation of such a packet in all cases which can lead to a native crash. Workarounds As workaround its possible to either disable the usage of the native SSLEngine or changing the code from: to:

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

    Published from ghsa record GHSA-4g8c-wm8x-jfhw

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-2025-24970

Advisory: SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine
IDs: CVE-2025-24970, GHSA-4g8c-wm8x-jfhw
Record: https://patchnext.com/advisories/cve-2025-24970 (revision 1, source checked 26 Oct 2026, 16:35 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 fix available; fixed versions by package: io.netty:netty-handler 4.1.118.Final. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.netty:netty-handler: affected >= 4.1.91.Final, <= 4.1.117.Final; fixed in 4.1.118.Final

## Suggested inspection (read-only)
- Maven io.netty:netty-handler: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.netty:netty-handler.
- 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://github.com/advisories/GHSA-4g8c-wm8x-jfhw (GitHub-reviewed advisory GHSA-4g8c-wm8x-jfhw lists affected ranges: Maven io.netty:netty-handler >=4.1.91.Final <=4.1.117.Final)

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