CVE-2026-48748Netty is a network application framework for development of protocol servers and clients.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Aug 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
netty netty netty:netty | from 4.2.0 before 4.2.15 | NVD |
References
- https://github.com/netty/netty/commit/75127cab731ee35068d1f0667bffa188bc332f5d
- https://github.com/netty/netty/releases/tag/netty-4.2.15.Finalrelease-notes
- https://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6vendor-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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.