CVE-2026-48748

EUVD-2026-36459
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 32.68%
Affected Products (NVD)
VendorProductVersion
nettynetty
4.2.0 ≤
𝑥
< 4.2.15
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
netty
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
netty
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/netty/netty/commit/75127cab731ee35068d1f0667bffa188bc332f5d
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
https://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6
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