CVE-2026-65654
Description
A flaw was found in github.com/temporalio/ringpop-go. A remote attacker, by sending specially crafted network messages to a Ringpop TChannel listener, can bypass configured limits on label maps. This allows the attacker to cause excessive memory and network bandwidth consumption, potentially leading to a denial of service (DoS) for the affected process.
Statement
Red Hat has rated this vulnerability as having an Important severity because an unauthenticated remote attacker can trigger a denial of service without requiring user interaction or elevated privileges. In Red Hat Ansible Automation Orchestrator environments using Temporal, Ringpop instances exchange cluster state via SWIM gossip over TChannel listeners. If these network endpoints are reachable by untrusted actors, an attacker can transmit oversized membership metadata that exhausts system memory and gossip bandwidth, rendering the orchestrator services unavailable.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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