Buffer Overflow in Netty Framework Affects Network Applications
CVE-2026-42582

7.5HIGH

Key Information:

Vendor

Netty

Status
Netty
Netty-codec-http3
Vendor
CVE Published:
13 May 2026

What is CVE-2026-42582?

A buffer overflow vulnerability has been identified in the Netty Framework prior to version 4.2.13.Final. This issue arises when decoding header blocks; specifically, the non-Huffman branch of the QpackDecoder may attempt to allocate a byte array without validating the specified length against the number of available readable bytes. This can lead to potential service disruptions or other unexpected behavior in applications utilizing affected versions of the Netty Framework.

Affected Version(s)

netty >= 4.2.0.Alpha1, < 4.2.13.Final

netty-codec-http3 >= 4.2.0.Alpha1, < 4.2.13.Final

References

https://github.com/netty/netty/security/advisories/GHSA-2...
x_refsource_CONFIRM

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

.