Hacktoberfest 2026: le issue che i maintainer hanno segnato per ottobre, aperte e adatte ai principianti. Sfoglia le issue Hacktoberfest

Server builder assets can overwrite the generated main.js entry point

Chiusa
  • Qualcosa non va?
#34,195 0 commenti 0 reazioni 0 assegnatari Vedi su GitHub

I maintainer di solito rispondono entro 1 giorno

Nessuno ha ancora preso questa issue.

Valutazione

Difficoltà
3/5
Tempo stimato
1-2 giorni
Idoneità per principianti
68/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
angular, typescript
Ambito
build-system, security

Direzione di ricerca

Start with packages/angular_devkit/build_angular/src/builders/server/index.ts, especially the call to copyAssets(), then read packages/angular_devkit/build_angular/src/utils/copy-assets.ts to trace destination writes. Run scripts/validate.sh in the linked reproduction to confirm the collision. Done means the server builder no longer allows an asset to replace generated main.js and the clean and attack scenarios behave as intended.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

area: @angular-devkit/build-angular gemini-triaged
Command

build, run

Is this a regression?

No. The server builder has copied configured assets after Webpack output since the assets option was released in 15.1.0.

The previous version in which this bug was not present was

No response.

Description

@angular-devkit/build-angular:server copies configured assets after Webpack emits the server program, without checking whether an asset destination is already a generated file.

With a recursive asset tree copied to output ., an asset named main.js silently replaces the generated server entry point. The build reports success, and normal node dist/server/main.js startup executes the asset instead of the generated application bundle.

I reproduced this with an asset-only dependency update. Version 1.0.0 contains only assets/data.json; version 1.0.1 adds only assets/main.js. Neither version declares scripts, main, exports, imports, or bin, installation uses --ignore-scripts, and the application never imports the package.

Expected: the build should reject an asset/generated-output collision, or keep generated output authoritative.

Actual: the build succeeds and the final dist/server/main.js is byte-for-byte identical to the dependency asset. Starting it executes dependency-controlled code as the deployed server process.

Minimal Reproduction

Repository: https://github.com/BlueIridium-Security/angular-server-asset-entry-collision-repro

git clone https://github.com/BlueIridium-Security/angular-server-asset-entry-collision-repro.git
cd angular-server-asset-entry-collision-repro
./scripts/validate.sh

The validator runs clean → attack → restored-clean → restored-attack. Across two fresh-container runs, clean 1.0.0 always emitted and started the same genuine 782,472-byte bundle with no marker; attack 1.0.1 always emitted the exact 192-byte package asset and executed its marker. Runtime networking is disabled, and the script fails on any control mismatch.

Exception or Error

No exception is reported. The builder reports successful bundle generation and asset copying.

Your Environment
Angular CLI: 22.2.0
@angular-devkit/build-angular: 22.2.0
Angular: 22.2.0
Node: 24.21.0
npm: 11.19.0
OS: Linux arm64 container (node:24.21.0-bookworm-slim)
Anything else relevant?

The builder is deprecated but remains shipped. The default server assets list is empty, and exploitation requires an opt-in recursive root-output rule plus an accepted package update, build, deployment, and startup. I therefore assess this as High rather than Critical.

Current source shows the server builder calling copyAssets() after successful Webpack output, while copyAssets() writes each destination without checking generated outputs.

This is distinct from #19157 and #16670, which discuss precedence between two configured asset inputs rather than a post-Webpack asset replacing the executable generated entry point.

Should the server builder reject configured asset destinations that collide with generated output files?

Lingua principale
TypeScript
Stelle
27k
Fork
11.8k
Merge medio
22h 50m
PR unite (30g)
168

Preparare l'ambiente

Come iniziare

  1. Leggi tutta la issue e poi la guida ai contributi del progetto.
  2. Commenta sulla issue per dire che te ne occupi tu — evita che due persone facciano lo stesso lavoro.
  3. Fai un fork del repository e lavora su un branch.
  4. Apri una pull request che faccia riferimento al numero della issue.

Altre issue di angular/angular-cli

Tutte le issue di angular/angular-cli

Issue simili

Altre issue su TypeScript

Ricevi le nuove issue nella tua casella

Un breve riepilogo di issue GitHub adatte ai principianti.