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🚨 [security] Update all of nestjs 9.3.12 → 11.1.27 (major)#658

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🚨 [security] Update all of nestjs 9.3.12 → 11.1.27 (major)#658
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@depfu depfu Bot commented Jun 19, 2026

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ @​nestjs/common (9.3.12 → 11.1.27) · Repo · Changelog

Security Advisories 🚨

🚨 nest allows a remote attacker to execute arbitrary code via the Content-Type header

File Upload vulnerability in nestjs nest prior to v.11.0.16 allows a remote attacker to execute arbitrary code via the Content-Type header.

🚨 nest allows a remote attacker to execute arbitrary code via the Content-Type header

File Upload vulnerability in nestjs nest prior to v.11.0.16 allows a remote attacker to execute arbitrary code via the Content-Type header.

Release Notes

Too many releases to show here. View the full release notes.

Commits

See the full diff on Github. The new version differs by 43 commits:

✳️ @​nestjs/core (9.3.12 → 11.1.27) · Repo · Changelog

Security Advisories 🚨

🚨 @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')

Impact

What kind of vulnerability is it? Who is impacted?

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. Spring Framework's own security patch (6e97587) 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

Release Notes

Too many releases to show here. View the full release notes.

Commits

See the full diff on Github. The new version differs by 43 commits:

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@depfu depfu Bot added the depfu label Jun 19, 2026
@github-actions github-actions Bot requested a review from Maelstromeous June 19, 2026 09:15
@depfu depfu Bot mentioned this pull request Jun 19, 2026
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