CVE-2026-93492 PUBLISHED

Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size

Assigner: redhat
Reserved: 18.09.2026 Published: 18.09.2026 Updated: 18.09.2026

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAX_HEADER_TABLE_SIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimately resulting in a Denial of Service (DoS).

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 5.3

Product Status

Vendor Red Hat
Product Red Hat AMQ Broker 7
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apache Camel 4 for Quarkus 3
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apache Camel for Spring Boot 4
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apicurio Registry 3
Versions Default: unknown
Vendor Red Hat
Product Red Hat build of Debezium 3
Versions Default: affected
Vendor Red Hat
Product Red Hat Build of Keycloak
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Quarkus
Versions Default: affected
Vendor Red Hat
Product Red Hat Data Grid 8
Versions Default: affected
Vendor Red Hat
Product Red Hat Fuse 7
Versions Default: unknown
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: unknown
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 8
Versions Default: affected
Vendor Red Hat
Product Red Hat Single Sign-On 7
Versions Default: unknown

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

References

Problem Types

  • CWE-1035 CWE