PatchSiren cyber security CVE debrief
CVE-2026-54465 faye CVE debrief
CVE-2026-54465 is a denial of service vulnerability in websocket-driver. A peer can make a single connection consume an unbounded amount of memory by sending an HTTP request or response with a never-ending list of headers. This issue affects users of websocket-driver, especially those implementing WebSocket servers or clients. The vulnerability can lead to the receiving process running out of memory, potentially causing significant disruptions. Users should be aware of this vulnerability and take steps to mitigate it, such as updating to version 0.8.1 or later. The CVE record was published on 2026-07-17T20:17:26.897Z and has not been modified since then.
- Vendor
- faye
- Product
- websocket-driver-ruby
- CVSS
- MEDIUM 6.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-17
- Original CVE updated
- 2026-07-17
- Advisory published
- 2026-07-17
- Advisory updated
- 2026-07-17
Who should care
Users of websocket-driver, especially those implementing WebSocket servers or clients, should be aware of this vulnerability and take steps to mitigate it. This includes updating to version 0.8.1 or later, monitoring for suspicious traffic patterns, and implementing rate limiting on header sizes for WebSocket connections. Additionally, users should review their system configurations and ensure that they are not exposed to this vulnerability.
Technical summary
The websocket-driver library, used for handling WebSocket protocols, has a vulnerability where a peer can cause a denial of service by sending an HTTP request or response with an endless list of headers, leading to unbounded memory consumption. This issue is fixed in version 0.8.1. The vulnerability affects websocket-driver versions prior to 0.8.1 and can be exploited by sending a specially crafted HTTP request or response. Users of websocket-driver should update to version 0.8.1 or later to mitigate this vulnerability.
Defensive priority
Medium priority due to the potential for denial of service attacks.
Recommended defensive actions
- Update websocket-driver to version 0.8.1 or later
- Monitor for suspicious traffic patterns that could indicate exploitation attempts
- Implement rate limiting on header sizes for WebSocket connections
- Consider using compensating controls such as Web Application Firewalls
- Inventory and patch vulnerable systems
- Review system configurations to ensure they are not exposed to this vulnerability
- Implement additional security measures to detect and prevent exploitation attempts
Evidence notes
The CVE record was published on 2026-07-17T20:17:26.897Z and has not been modified since then. The NVD entry is currently 6.3 MEDIUM. Limited information is available about the specific details of the vulnerability, but it is known to affect websocket-driver versions prior to 0.8.1. The vulnerability can be exploited by sending a specially crafted HTTP request or response with an endless list of headers, leading to unbounded memory consumption.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-17T20:17:26.897Z and has not been modified since then.