Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
exploitation probability
0.4%top 68% of all CVEs
observed exploitation
nono source reports it
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
netty · nettyReferences
https://access.redhat.com/security/cve/CVE-2026-48748https://bugzilla.redhat.com/show_bug.cgi?id=2488441https://github.com/netty/netty/commit/75127cab731ee35068d1f0667bffa188bc332f5dhttps://github.com/netty/netty/releases/tag/netty-4.2.15.Finalhttps://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48748.json