Resource exhaustion in Red Hat Amq Broker 7
CVE-2026-93488
A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-93488 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/netty/netty/releases/tag/netty-4.1.138.Final
- github.com/netty/netty/releases/tag/netty-4.2.18.Final
- access.redhat.com/errata/RHSA-2026:69470 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:69440 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:70257 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83612 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-93488?
- CVE-2026-93488 is a high-severity vulnerability in Red Hat Amq Broker 7, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-18.
- How severe is CVE-2026-93488?
- High severity. CVSS v3 base score is 7.5 out of 10.