5.3

CVE-2026-47244: netty Uncontrolled Resource Consumption

CVSS: 5.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-47244DEBIAN-CVE-2026-47244CGA-227r-wg7m-9m5q
Published 12-06-2026Last modified 12-06-2026
Open JSON

Vulnerability summary

CVE-2026-47244 is a medium (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in netty. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:11033-1SUSE-SU-2026:2802-1CGA-GX8G-3442-4262

Timeline

  1. 12-06-2026
    PublishedVulnerability first disclosed.
  2. 12-06-2026
    Last modifiedVulnerability information updated.

Description

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.21 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard200 products
  • airbyte-server< 2.0.0-r1
  • airbyte-server-fips< 2.0.0-r1
  • akhq< 0.27.1-r3
  • apache-camel-karavan-devmode< 4.18.1-r3
  • apache-hop< 2.18.0-r6

1 vendor · 200 products · Showing 200 of 294. Use Open JSON for the complete list.

References

9 links