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Update dependency next to v15.5.13 [SECURITY]#569

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renovate/npm-next-vulnerability
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Update dependency next to v15.5.13 [SECURITY]#569
renovate[bot] wants to merge 1 commit intomainfrom
renovate/npm-next-vulnerability

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@renovate renovate bot commented Mar 21, 2026

This PR contains the following updates:

Package Change Age Confidence
next (source) 15.5.1115.5.13 age confidence

GitHub Vulnerability Alerts

CVE-2026-29057

Summary

When Next.js rewrites proxy traffic to an external backend, a crafted DELETE/OPTIONS request using Transfer-Encoding: chunked could trigger request boundary disagreement between the proxy and backend. This could allow request smuggling through rewritten routes.

Impact

An attacker could smuggle a second request to unintended backend routes (for example, internal/admin endpoints), bypassing assumptions that only the configured rewrite destination/path is reachable. This does not impact applications hosted on providers that handle rewrites at the CDN level, such as Vercel.

Patches

The vulnerability originated in an upstream library vendored by Next.js. It is fixed by updating that dependency’s behavior so content-length: 0 is added only when both content-length and transfer-encoding are absent, and transfer-encoding is no longer removed in that code path.

Workarounds

If upgrade is not immediately possible:

  • Block chunked DELETE/OPTIONS requests on rewritten routes at your edge/proxy.
  • Enforce authentication/authorization on backend routes per our security guidance.

Release Notes

vercel/next.js (next)

v15.5.13

Compare Source

v15.5.12

Compare Source

[!NOTE]
This release is backporting bug fixes. It does not include all pending features/changes on canary.

  • fix unlock in publish-native

This is a re-release of v15.5.11 applying the turbopack changes.


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@renovate renovate bot added the docs Improvements or additions to documentation label Mar 21, 2026
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