CVE-2026-28412
Published: 02 March 2026
Summary
CVE-2026-28412 is a medium-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Fka Textream. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 19.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-10 (Concurrent Session Control) and SC-5 (Denial-of-service Protection).
Deeper analysis
CVE-2026-28412 is a denial-of-service vulnerability in Textream, a free macOS teleprompter application. Prior to version 1.5.1, the DirectorServer WebSocket server within the app imposes no limit on concurrent connections. This issue, classified under CWE-400 (Uncontrolled Resource Consumption), combines with a broadcast timer that sends state updates to all connected clients every 100 milliseconds, enabling resource exhaustion. The vulnerability received a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) and was published on 2026-03-02.
A remote attacker can exploit this vulnerability by flooding the DirectorServer with concurrent WebSocket connections, overwhelming CPU and memory usage. This causes the Textream application to freeze and crash, particularly during live sessions. Exploitation requires no privileges but involves low complexity over the network and some user interaction, such as enabling the DirectorServer feature in the app.
Mitigation is available in Textream version 1.5.1, which addresses the unbounded connection issue. The GitHub security advisory (GHSA-qr5p-7x47-qxh9) and the fixing commit (3524fa96f98ba17025b48ce9e19d49d859fc2ec1) provide further details on the patch. Security practitioners should advise users to update to version 1.5.1 or later.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9201
Vulnerability details
Textream is a free macOS teleprompter app. Prior to version 1.5.1, the `DirectorServer` WebSocket server imposes no limit on concurrent connections. Combined with a broadcast timer that sends state to all connected clients every 100 ms, an attacker can exhaust…
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CPU and memory by flooding the server with connections, causing the Textream application to freeze and crash during a live session. Version 1.5.1 fixes the issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote exploitation of unbounded WebSocket connections in the DirectorServer to trigger resource exhaustion and application crash, directly matching T1499.004 (Application or System Exploitation) for Endpoint Denial of Service.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces a limit on concurrent WebSocket connections to the DirectorServer, preventing the unbounded connection flood that exhausts CPU and memory.
Requires mechanisms to protect against or limit the effects of denial-of-service attacks that exploit uncontrolled resource consumption via connection flooding.
Ensures availability of system resources by constraining allocation to the broadcast timer and client state updates, mitigating exhaustion from unlimited connections.