Denial of Service Vulnerability in Netty's HTTP/2 HpackEncoder
CVE-2026-93492

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat AMQ Broker 7
Red Hat Build Of Apache Camel 4 For Quarkus 3
Red Hat Build Of Apache Camel For Spring Boot 4
Red Hat Build Of Apicurio Registry 3
Vendor
CVE Published:
18 September 2026

What is CVE-2026-93492?

A vulnerability exists in Netty's HTTP/2 HpackEncoder, where a remote attacker can exploit it by sending deliberately crafted HTTP/2 SETTINGS frames with an unusually large MAX_HEADER_TABLE_SIZE. This manipulation forces the HpackEncoder to handle an excessive number of unique headers, significantly increasing both CPU usage and memory consumption. Such resource exhaustion can ultimately lead to a Denial of Service (DoS), impacting the performance and availability of services dependent on this library.

References

https://access.redhat.com/security/cve/CVE-2026-93492
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536895
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
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

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