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High, CVSS 7.5

Reactor Netty HTTP Server denial of service vulnerability

CVE-2023-34054GHSA-q24v-hpg3-v3jp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.projectreactor.netty:reactor-netty-core 1.1.13, 1.0.39), 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-2023-34054: 0.91% estimated exploitation activity in the next 30 days; percentile 60.14 (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 Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition. Specifically, an application is vulnerable if Reactor Netty HTTP Server built-in integration with Micrometer is enabled.

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

    Published from ghsa record GHSA-q24v-hpg3-v3jp

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-2023-34054

Advisory: Reactor Netty HTTP Server denial of service vulnerability
IDs: CVE-2023-34054, GHSA-q24v-hpg3-v3jp
Record: https://patchnext.com/advisories/cve-2023-34054 (revision 1, source checked 26 Oct 2026, 16:30 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.projectreactor.netty:reactor-netty-core 1.1.13, 1.0.39. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.projectreactor.netty:reactor-netty-core: affected >= 1.1.0, < 1.1.13; >= 1.0.0, < 1.0.39; fixed in 1.0.39, 1.1.13

## Suggested inspection (read-only)
- Maven io.projectreactor.netty:reactor-netty-core: 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.projectreactor.netty:reactor-netty-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://github.com/advisories/GHSA-q24v-hpg3-v3jp (GitHub-reviewed advisory GHSA-q24v-hpg3-v3jp lists affected ranges: Maven io.projectreactor.netty:reactor-netty-core >=1.1.0 =1.0.0 <1.0.39)

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