Memory Exhaustion Vulnerability in Netty HTTP/3 Codec by Netty
CVE-2026-44892

7.5HIGH

Key Information:

Vendor

Netty

Status
Netty
Vendor
CVE Published:
12 June 2026

What is CVE-2026-44892?

The Netty HTTP/3 codec previously had a default configuration in its Http3ConnectionHandler that did not enforce a maximum header size limit. This oversight meant that if a peer client or server failed to set the HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE, the framework permitted an unlimited number of headers to be sent. As a result, an attacker could exploit this flaw to create conditions leading to memory exhaustion and a Denial of Service (DoS) via an OutOfMemoryError. An update in version 4.2.15.Final introduces a critical patch to address this issue.

Affected Version(s)

netty >= 4.2.0.Final, < 4.2.15.Final

References

https://github.com/netty/netty/security/advisories/GHSA-c...
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https://github.com/netty/netty/releases/tag/netty-4.2.15....
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.