Vulnerability · Published Sep 18, 2026 · Assigned by redhat
CVE-2026-93492Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size
Medium 5.3
In plain English
A medium-severity security flaw in Red Hat AMQ Broker 7 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 65.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | netty | no fix listed | DEBIAN-CVE-2026-93492 |
| Debian:13 | netty | no fix listed | DEBIAN-CVE-2026-93492 |
| Debian:14 | netty | no fix listed | DEBIAN-CVE-2026-93492 |
| Ubuntu:26.10 | netty | no fix listed | UBUNTU-CVE-2026-93492 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Build of Debezium 3.6 | see references |
| Red Hat | Red Hat build of Quarkus 3.27.5.SP2 | see references |
| Red Hat | Red Hat build of Quarkus 3.33.3.SP2 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | see references |
| Red Hat | Red Hat AMQ Broker 7 | see references |
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | see references |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | see references |
| Red Hat | Red Hat build of Apicurio Registry 3 | see references |
| Red Hat | Red Hat Build of Keycloak | see references |
| Red Hat | Red Hat Data Grid 8 | see references |
| Red Hat | Red Hat Fuse 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | see references |
| Red Hat | Red Hat Single Sign-On 7 | see references |
Weakness: CWE-1035 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- RHSA-2026:69440 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:69470 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:83612 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:95221 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-93492 vdb-entry, x_refsource_REDHAT
- RHBZ#2536895 issue-tracking, x_refsource_REDHAT