Sourced from next's releases.

v12.0.9

This upgrade is completely backward-compatible and recommended for all users on versions below 12.0.9

Vulnerable code could allow a bad actor to trigger a denial of service attack via the /${locale}/_next/ route for anyone running a Next.js app at version >= 12.0.0, and using built-in i18n routing functionality.

How to Upgrade

• We have released patch versions for both the stable and canary channels of Next.js.
• To upgrade run npm install next@latest --save

Impact

• Affected: All of the following must be true to be affected by this CVE
  • Next.js versions between v12.0.0 and v12.0.9
  • Using next start or a custom server
  • Using the built-in i18n support
• Not affected:
  • Deployments on Vercel (vercel.com) are not affected along with similar environments where invalid requests are filtered before reaching Next.js.

We recommend everyone to upgrade regardless of whether you can reproduce the issue or not.

How to Assess Impact

If your server has seen requests to any route under the prefix /${locale}/_next/ that have triggered a heap overflow error, this was caused by the patched issue.

What is Being Done

As Next.js has grown in popularity and usage by enterprises, it has received the attention of security researchers and auditors. We are thankful to our users for their investigation and responsible disclosure of the original bug.

We've landed a patch that ensures this is handled properly so the requested route no longer crashes and triggers a heap overflow.

Regression tests for this attack were added to the i18n integration test suite

• A public CVE was released.
• We encourage responsible disclosure of future reports. Please email us at [email protected]. We are actively monitoring this mailbox.

Core Changes

• middlewares: limit process.env to inferred usage: #33186
• update webpack: #33207
• Abstract out native filesystem usage from the base server: #33226
• use text data url instead of base64 for shorter encoding: #33218
• chore(deps): upgrade postcss: #33142
• Fix global process testing for the process polyfill: #33220
• Update swc: #33201
• improve full refresh overlay: #33301
• Custom app for server components: #33149
• Update yarn PnP tests and disable swc file reading for PnP: #33236
• Base Http for BaseServer: #32999
• Update swc: #33342

... (truncated)

• 07431d3 v12.0.9
• c938e20 v12.0.9-canary.12
• c385d1b REMOVE: duplicate key in docs/testing.md (#33681)
• 9b98c5a chore(docs): update security headers specification (#33673)
• 865a079 v12.0.9-canary.11
• b5d4564 Revert "Relay Support in Rust Compiler" (#33699)
• 5c6c385 Use relative path for example (#33565)
• 65c63c9 v12.0.9-canary.10
• b20eb99 Relay Support in Rust Compiler (#33240)
• 99d4d6c Implement web server as the request handler for edge SSR (#33635)
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• 7efb22a 1.2.6
• ef88b93 security notice for additional prototype pollution issue
• c2b9819 isConstructorOrProto adapted from PR
• bc8ecee test from prototype pollution PR
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Sourced from next's releases.

v12.1.0

Core Changes

• Relay Support in Rust Compiler: #33702
• fix eslint link-passhref rule: #33857
• update webpack: #33831
• Flush buffered vitals metrics on page mount: #33867
• fix problem with HMR when middleware and page reference the same node_module: #33873
• Refactor page component getter in web server: #33759
• update NextResponse default redirect status to 307 to match docs: #33505
• Bug fix: dynamic page should not be interpreted as predefined page: #33808
• Group streaming experimental apis: #33878
• Encapsulate routing and initial hydration: #33875
• Optimize offline condition judgment: #33238
• Ensure external beforeFiles rewrites are handled with next/link: #33888
• Fix parsing params for i18n optional route in minimal mode: #33896
• Ensure browserslist extends works properly: #33890
• Fix image cache race condition: #33883
• Add support for Relay projects without artifactDirectory: #33918
• fix: handle jsxspreadattribute in inline-script-id eslint rule: #32421
• feat(next-swc): Update swc: #33724
• Update to latest version of amphtml-validator: #33967
• Warn in dev mode when script tags are added with next/head: #33968
• Ensure optional chaining in swc matches babel: #33995
• Use react-dom/server.browser in Node.js: #33950
• Ensure external middleware rewrite is handled correctly: #33962
• Update Terser to v5.10.0, fix minification issues: #33045
• Warn in dev mode when stylesheets are added using next/head: #34004
• Use ReadableStream in RenderResult: #34005
• Fix suffix ordering while streaming: #34011
• Don't use yarn if a package-lock.json file is found: #31926
• Do not warn when application/ld+json scripts are used with next/head: #34021
• Babel & next-swc: Fix exporting page config with AsExpression: #32702
• Detect per page runtime config for functions manifest: #33945
• Add JSDoc to config options: #32915
• Update font-stylesheet-gathering-plugin.ts: #30709
• Add decoratorMetadata flag if enabled by tsconfig: #32914
• fix: data url handling in css-loader: #34034
• Place 'charset' element at the top of : #28119
• Fix detection of anchor click events inside svg: #23272
• Allow passing nothing as custom jest config: #32328
• Fixes #31240: Adding a recursive addPackagePath function in webpack-config: #31264
• Require component rendered as child of Link to pass event to onClick handler: #27723
• Allow scroll prevention on hash change: #31921
• Add support for async fn / promise in next.config.js/.mjs: #33662
• Fix lazyRoot functionality for next/image: #33933
• Change SWC minify from beta to release candidate: #34056
• Make Router state immutable: #33925
• Stop exposing internal render and renderError methods from next/client: #34069
• Add api-utils helper for testing: #34078

... (truncated)

• 8545fd1 v12.1.0
• 1605f30 v12.0.11-canary.21
• 69aedbd Fix typo (#34480)
• f0f322c Remove deprecation for relative URL usage in middlewares (#34461)
• d4d79b2 Fix chunk buffering for server components (#34474)
• 74fa4d4 update webpack (#34477)
• b70397e Revert "Allow reading request bodies in middlewares (#34294)" (#34479)
• 4202011 Update font-optimization test snapshot (#34478)
• 1edd851 Allow reading request bodies in middlewares (#34294)
• ba78437 fix: don't wrap profile in firebase example (#34457)
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