Vulnerability Details CVE-2026-48748
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 32.0%
CVSS Severity
CVSS v3 Score 7.5
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
Products affected by CVE-2026-48748
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cpe:2.3:a:netty:netty:4.2.0
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cpe:2.3:a:netty:netty:4.2.1
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cpe:2.3:a:netty:netty:4.2.10
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cpe:2.3:a:netty:netty:4.2.11
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cpe:2.3:a:netty:netty:4.2.12
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cpe:2.3:a:netty:netty:4.2.13
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cpe:2.3:a:netty:netty:4.2.14
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cpe:2.3:a:netty:netty:4.2.2
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cpe:2.3:a:netty:netty:4.2.3
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cpe:2.3:a:netty:netty:4.2.4
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cpe:2.3:a:netty:netty:4.2.5
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cpe:2.3:a:netty:netty:4.2.6
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cpe:2.3:a:netty:netty:4.2.7
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cpe:2.3:a:netty:netty:4.2.8
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cpe:2.3:a:netty:netty:4.2.9