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we need to exclude the bundler tests from being upgraded in renovate config edit: this should do it |
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Janpot
approved these changes
Mar 23, 2026
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This PR contains the following updates:
15.5.12→15.5.1315.5.12→15.5.14GitHub Vulnerability Alerts
CVE-2026-29057
Summary
When Next.js rewrites proxy traffic to an external backend, a crafted
DELETE/OPTIONSrequest usingTransfer-Encoding: chunkedcould 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: 0is added only when bothcontent-lengthandtransfer-encodingare absent, andtransfer-encodingis no longer removed in that code path.Workarounds
If upgrade is not immediately possible:
DELETE/OPTIONSrequests on rewritten routes at your edge/proxy.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. SettingmaximumDiskCacheSize: 0disables disk caching.Workarounds
If upgrade is not immediately possible:
.next/cache/images.images.localPatterns,images.remotePatterns, andimages.qualities)Release Notes
vercel/next.js (next)
v15.5.13Compare Source
Configuration
📅 Schedule: Branch creation - "" in timezone UTC, Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.
This PR was generated by Mend Renovate. View the repository job log.