CVE-2026-35515
mediumPriorität · verfolgen · 24EPSS 0.003 · 21. PerzentilDEEUUSEPSS · bewertet 2026-10-23
Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.18, SseStream._transform() interpolates message.type and message.id directly into Server-Sent Events text protocol output without sanitizing newline characters (\r, \n). Since the SSE protocol treats both \r and \n as field delimiters and \n\n as event boundaries, an attacker who can influence these fields through upstream data sources can inject arbitrary SSE events, spoof event types, and corrupt reconnection state. This vulnerability is fixed in 11.1.18.
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · low–medium · 1.7–6.3
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- WID-SEC-W-2026-3046IBM Concert: Mehrere SchwachstellenDeutsch2026-08-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in IBM Concert ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
- GHSA-36xv-jgw5-4q75@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')2026-04-06ghsa · osvUS
### Impact _What kind of vulnerability is it? Who is impacted?_ [`SseStream._transform()`](https://github.com/nestjs/nest/blob/dea5279ef8fcb568de158003e4281759a2cd7675/packages/core/router/sse-stream.ts) interpolates `message.type` and `message.id` directly into Server-Sent Events text protocol output without sanitizing newline characters (`\r`, `\n`). Since the SSE protocol treats both `\r` and `\n` as field delimiters and `\n\n` as event boundaries, an attacker who can influence these fields through upstream data sources can inject arbitrary SSE events, spoof event types, and corrupt reconnection state. Spring Framework's own security patch ([6e97587](https://github.com/spring-projects/spring-framework/commit/6e9758700a4946be1dca85ca937ef2603e291301)) validates these same fields (`id`, `event`) for the same reason. Actual impact: - **Event spoofing**: Attacker forges SSE events with arbitrary `event:` types, causing client-side `EventSource.addEventListener()` callbacks to fire for wrong event types. - **Data injection**: Attacker injects arbitrary `data:` payloads, potentially triggering XSS if the client renders SSE data as HTML without sanitization. - **Reconnection corruption**: Attacker injects `id:` fields, corrupting the `Last-Event-ID` header on reconnection, causing the client to miss or replay events. - **Attack precondition**: Requires the developer to map user-influenced data to the `type` or `id` fields of SSE messages. Direct HTTP request input does not reach these fields without developer code bridging the gap. - ### Patches _Has the problem been patched? What versions should users upgrade to?_ Patched in `@nestjs/core@11.1.18`
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