fix(deps): update dependency next to v15.5.14 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
next (source)	15.5.10 → 15.5.14

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.

CVE-2026-27980

Summary

The default Next.js image optimization disk cache (/_next/image) did not have a configurable upper bound, allowing unbounded cache growth.

Impact

An attacker could generate many unique image-optimization variants and exhaust disk space, causing denial of service. Note that this does not impact platforms that have their own image optimization capabilities, such as Vercel.

Patches

Fixed by adding an LRU-backed disk cache with images.maximumDiskCacheSize, including eviction of least-recently-used entries when the limit is exceeded. Setting maximumDiskCacheSize: 0 disables disk caching.

Workarounds

If upgrade is not immediately possible:

• Periodically clean .next/cache/images.
• Reduce variant cardinality (e.g., tighten values for images.localPatterns, images.remotePatterns, and images.qualities)

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Release Notes

vercel/next.js (next)

v15.5.14

Compare Source

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.

v15.5.11

Compare Source

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

Core Changes

• Tracing: Fix memory leak in span map (#​85529)
• fix: ensure LRU cache items have minimum size of 1 to prevent unbounded growth (#​89134)
• Turbopack: fix NFT tracing of sharp 0.34 (#​82340)
• Turbopack: support pattern into exports field (#​82757)
• NFT tracing fixes (#​84155 and #​85323)
• Turbopack: validate CSS without computing all paths (#​83810)
• feat: implement LRU cache with invocation ID scoping for minimal mode response cache (#​89129)

Credits

Huge thanks to @​timneutkens, @​mischnic, @​ztanner, and @​wyattjoh for helping!

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Project	Deployment	Actions	Updated (UTC)
frontends	Ready	Preview, Comment	Mar 23, 2026 5:57pm