Packages / acorn / Security

HighVulnerabilityGHSA-6chw-6frg-f759Published 3 Apr 2020

Regular Expression Denial of Service in Acorn

Affected releases · acorn

  • 7.x7.0.0 – 7.1.0Fixed in 7.1.1
  • 6.x6.0.0 – 6.4.0Fixed in 6.4.1
  • 5.x5.5.0 – 5.7.3Fixed in 5.7.4

On 7.x, the newest line:

npm install acorn@7.1.1
8.x

  1. Not affected

    8.0.0 – 8.19.0

    39 releases, latest

7.x

  1. Affected

    7.0.0 – 7.1.0

    2 releases

  2. Fixed

    7.1.1 – 7.4.1

    6 releases

6.x

  1. Affected

    6.0.0 – 6.4.0

    14 releases

  2. Fixed

    6.4.1 – 6.4.2

    2 releases

5.x

  1. Not affected

    5.0.0 – 5.4.1

    12 releases

  2. Affected

    5.5.0 – 5.7.3

    11 releases

  3. Fixed

    5.7.4

    1 release

142 stable releases of acorn, oldest to newest, one row per major.

Is your project affected?

Paste your package.json, or type the range you declare for acorn. It is read in your browser and sent nowhere.

What happens

Affected versions of acorn are vulnerable to Regular Expression Denial of Service. A regex in the form of /[x-\ud800]/u causes the parser to enter an infinite loop. The string is not valid UTF16 which usually results in it being sanitized before reaching the parser. If an application processes untrusted input and passes it directly to acorn, attackers may leverage the vulnerability leading to Denial of Service.