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Starting in version 4.2.0.Final and prior to version 4.2.15.Final, a memory exhaustion vulnerability in the Netty HTTP/3 codec allows the creation… (CVE-2026-48748)

0
Medium
VulnerabilityCVE-2026-48748gcveosvubuntu-cve-2026-48748cve-2026-48748ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-pro-26-04-lts
Published: 06/12/2026 (06/12/2026, 16:16:00 UTC)
Source: GCVE Database
Product: netty

Description

A memory exhaustion vulnerability exists in the Netty HTTP/3 codec in versions starting from 4.2.0.Final up to but not including 4.2.15.Final. This flaw allows the creation of an infinite number of blocked streams, potentially causing an out-of-memory (OOM) error. The issue is patched in version 4.2.15.Final.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-infra-legacy/trusty
Affected versions
=1:3.2.6.Final-2=1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1=1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
Ubuntu:Pro:16.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps-legacy/xenial
Affected versions
=1:3.2.6.Final-2=1:4.0.32-1=1:4.0.33-1=1:4.0.34-1=1:4.0.34-1ubuntu0.1~esm1=1:4.0.34-1ubuntu0.1~esm2=1:4.0.34-1ubuntu0.1~esm3=1:4.0.34-1ubuntu0.1~esm4=1:4.0.34-1ubuntu0.1~esm5
Ubuntu:Pro:18.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/bionic
Affected versions
=1:4.1.7-4=1:4.1.7-4ubuntu0.1~esm1=1:4.1.7-4ubuntu0.1=1:4.1.7-4ubuntu0.1+esm1=1:4.1.7-4ubuntu0.1+esm2=1:4.1.7-4ubuntu0.1+esm3=1:4.1.7-4ubuntu0.1+esm4=1:4.1.7-4ubuntu0.1+esm5=1:4.1.7-4ubuntu0.1+esm6=1:4.1.7-4ubuntu0.1+esm7
Ubuntu:Pro:20.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/focal
Affected versions
=1:4.1.33-1=1:4.1.33-2=1:4.1.33-3=1:4.1.45-1=1:4.1.45-1ubuntu0.1~esm1=1:4.1.45-1ubuntu0.1~esm2=1:4.1.45-1ubuntu0.1~esm3=1:4.1.45-1ubuntu0.1~esm4=1:4.1.45-1ubuntu0.1~esm6=1:4.1.45-1ubuntu0.1~esm7
Ubuntu:Pro:22.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/jammy
Affected versions
=1:4.1.48-4=1:4.1.48-4+deb11u1build0.22.04.1=1:4.1.48-4+deb11u2build0.22.04.1=1:4.1.48-4+deb11u2ubuntu0.1~esm1=1:4.1.48-4+deb11u2ubuntu0.1~esm2=1:4.1.48-4+deb11u2ubuntu0.1=1:4.1.48-4+deb11u2ubuntu0.1+esm1=1:4.1.48-4+deb11u2ubuntu0.1+esm3=1:4.1.48-4+deb11u2ubuntu0.2=1:4.1.48-4+deb11u2ubuntu0.2+esm1
Ubuntu:Pro:24.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/noble
Affected versions
=1:4.1.48-7=1:4.1.48-8=1:4.1.48-9=1:4.1.48-9ubuntu0.1~esm1=1:4.1.48-9ubuntu0.1~esm2=1:4.1.48-9ubuntu0.1=1:4.1.48-9ubuntu0.1+esm1=1:4.1.48-9ubuntu0.1+esm3=1:4.1.48-9ubuntu0.2=1:4.1.48-9ubuntu0.2+esm1=1:4.1.48-9ubuntu0.2+esm2
Ubuntu:25.10more threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=questing
Affected versions
=1:4.1.48-10=1:4.1.48-10ubuntu0.25.10.1=1:4.1.48-10ubuntu0.25.10.2
Ubuntu:26.10more threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=stonking
Affected versions
=1:4.1.48-16=1:4.1.48-16ubuntu1
Ubuntu:Pro:26.04:LTSmore threats →ghsa
netty
pkg:deb/ubuntu/netty?arch=source&distro=esm-apps/resolute
Affected versions
=1:4.1.48-10=1:4.1.48-11=1:4.1.48-12=1:4.1.48-13=1:4.1.48-14=1:4.1.48-16=1:4.1.48-16ubuntu0.1~esm2

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 01:06:00 UTC

Technical Analysis

Netty, a network application framework, has a memory exhaustion vulnerability in its HTTP/3 codec in versions >=4.2.0.Final and <4.2.15.Final. The vulnerability allows an attacker to create an unlimited number of blocked streams, which can exhaust memory resources and lead to an OOM error. This flaw is addressed and fixed in version 4.2.15.Final.

Potential Impact

The vulnerability can cause a denial of service condition by exhausting memory resources due to the creation of infinite blocked streams. There is no impact on confidentiality or integrity reported. The CVSS score is 7.5 (medium severity) with an impact primarily on availability.

Mitigation Recommendations

Upgrade to Netty version 4.2.15.Final or later to remediate this vulnerability. No other mitigations are specified or required as the issue is fixed in this official patch.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-48748
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1

Threat ID: 6ad3f61f2cdf04f656664277

Added to database: 10/17/2026, 22:26:39 UTC

Last enriched: 10/18/2026, 01:06:00 UTC

Last updated: 10/18/2026, 01:06:01 UTC

Views: 3

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