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Advisory record · GHSA-q24v-hpg3-v3jp

Reactor Netty HTTP Server denial of service vulnerability

CVSS 5.3 MediumEPSS 0.0091 · 60th percentile

Published by the GitHub Advisory Database at 28 Nov 2023, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.projectreactor.netty:reactor-netty-coreMaven>=1.1.0, <1.1.13 || >=1.0.0, <1.0.391.1.13, 1.0.39
Identifiers
GHSA-q24v-hpg3-v3jp · CVE-2023-34054
Published
28 Nov 2023
Updated
7 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Reactor Netty HTTP Server versions 1.0.x before 1.0.39 and 1.1.x before 1.1.13 are vulnerable to a denial-of-service condition. An attacker can send specially crafted HTTP requests, but only if the built-in Micrometer integration is enabled in the application. Upgrade reactor-netty-core to 1.0.39 or 1.1.13 or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (vmware)
  • CISA KEV Not listed.
  • EPSS 0.0091, the 60th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.