EUVD-2026-82929
GHSA-wfpc-rccm-rq4m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated network attacker triggers unbounded queue growth with low complexity against an exposed WebSocket endpoint; impact is availability-only memory exhaustion, no confidentiality or integrity effect.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
Unbounded Per-Connection Queue Growth in WebSocketServerExtensionHandler Leads to Denial of Service
Articles & Coverage 1
AnalysisAI
Unbounded per-connection queue growth in Netty's WebSocketServerExtensionHandler lets unauthenticated remote attackers exhaust server memory (OutOfMemory) and cause denial of service in Red Hat products that bundle the affected Netty code, including AMQ Broker 7, AMQ Clients, Build of Keycloak, Build of Quarkus, Camel for Spring Boot 4, Camel 4 for Quarkus 3, Data Grid 8, Fuse 7, JBoss EAP 7/8, Single Sign-On 7, Apicurio Registry 3 and Debezium 3. The flaw carries CVSS 3.1 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - unauthenticated, no user interaction, availability-only) and is reachable only where a Netty-based server exposes a WebSocket endpoint that negotiates protocol extensions such as permessage-deflate to untrusted clients. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitable only against a Netty-based server whose channel pipeline includes WebSocketServerExtensionHandler and exposes a WebSocket endpoint that negotiates protocol extensions (e.g., permessage-deflate) to untrusted clients. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but moderate-priority availability issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis; the only authoritative sources supplied are the Red Hat CVE page (https://access.redhat.com/security/cve/CVE-2026-93558) and Bugzilla tracking entry (https://bugzilla.redhat.com/show_bug.cgi?id=2536932), so affected organisations should monitor those for the fixed Netty build and the corresponding Red Hat product errata before scheduling upgrades. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all internet-facing and internal WebSocket endpoints running the listed Red Hat products (JBoss EAP 7/8, AMQ Broker 7, AMQ Clients, Keycloak, Quarkus, Camel for Spring Boot 4, Camel 4 for Quarkus 3, Data Grid 8, Fuse 7, Single Sign-On 7, Apicurio Registry 3, Debezium 3) and determine whether they negotiate protocol extensions such as permessage-deflate; if not required, disable WebSocket extension negotiation and apply connection/queue limits or reverse-proxy caps, and enable memory/OOM alerting. …
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