fix(deps): update dependency next to v15.5.21 [security] - #1841
fix(deps): update dependency next to v15.5.21 [security]#1841renovate[bot] wants to merge 1 commit into
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📦 Next.js Bundle Analysis for kamiThis analysis was generated by the Next.js Bundle Analysis action. 🤖 🎉 Global Bundle Size Decreased
DetailsThe global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster. Any third party scripts you have added directly to your app using the If you want further insight into what is behind the changes, give @next/bundle-analyzer a try! Twenty Pages Changed SizeThe following pages changed size from the code in this PR compared to its base branch:
DetailsOnly the gzipped size is provided here based on an expert tip. First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If Any third party scripts you have added directly to your app using the The "Budget %" column shows what percentage of your performance budget the First Load total takes up. For example, if your budget was 100kb, and a given page's first load size was 10kb, it would be 10% of your budget. You can also see how much this has increased or decreased compared to the base branch of your PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this. If you see "+/- <0.01%" it means that there was a change in bundle size, but it is a trivial enough amount that it can be ignored. |




This PR contains the following updates:
15.5.18→15.5.21Next.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-64644 / GHSA-q8wf-6r8g-63ch
More information
Details
Impact
When self-hosting Next.js with the default image loader, the Image Optimization API can optimize remotely hosted images if configured (not enabled by default). If those images contain malicious content, they can cause CPU exhaustion in
/_next/imageendpoints.config.images.remotePatterns, only the patterns in that array are impacted.config.images.unoptimized: true, you are NOT impacted.config.images.loader: 'custom', you are NOT impacted.Workarounds
If you cannot upgrade immediately, you can avoid the expensive work by setting
config.experimental.imgOptSkipMetadata : true.Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js: Server-Side Request Forgery in Server Actions on custom servers
CVE-2026-64649 / GHSA-89xv-2m56-2m9x
More information
Details
Impact
When a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization.
Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected;
next startand standalone output do the same from version 14.2 onward.Workarounds
If you cannot upgrade, ensure clients do not control the host header your application receives. Pin or validate
HostandX-Forwarded-Hostat your edge or proxy. On version 14.2.0 and later, you can additionally set the__NEXT_PRIVATE_ORIGINenvironment variable to your deployment's real origin:or from a
hascapture:Workarounds
If you cannot upgrade immediately, do not build the hostname of an external
rewrites()orredirects()destination from user-controlled input. If a dynamic subdomain is required, constrain the value to hostname-safe characters:value: '(?<region>[a-z0-9-]+)'.Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
vercel/next.js (next)
v15.5.21Compare Source
v15.5.20Compare Source
Contains no changes except publishing
@next/swc-wasm-webwhich was accidentally not published since 15.5.15.v15.5.19: 15.5.19Compare Source
Core Changes
FormDataentries (#94244)Other
Credits
Huge thanks to @eps1lon for helping!
Configuration
📅 Schedule: (UTC)
🚦 Automerge: Enabled.
♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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