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Vulnerability record · CVE-2026-48748 · published 12 June 2026

CVE-2026-48748: Netty allocation without limits vulnerability

Netty · Netty

Netty is a network application framework for development of protocol servers and clients. 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 of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.

7.5 CVSS 3.1 High EPSS 0.68% · top 49.4% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
4 Aug 2026Last modified by NVD

Description

Netty is a network application framework for development of protocol servers and clients. 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 of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/netty/netty/commit/75127cab731ee35068d1f0667bffa188bc332f5d
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final Release Notes
https://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-48748
https://bugzilla.redhat.com/show_bug.cgi?id=2488441
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48748.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-48748), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.