Inefficient RexExp complexity in generated code with .replace when transpiling named capturing groups
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 7.26.10, 8.0.0-alpha.17
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: poc
- Automatable: no
- Technical impact: partial
Summary
Babel is a compiler for writing next generation JavaScript. When using versions of Babel prior to 7.26.10 and 8.0.0-alpha.17 to compile regular expression named capturing groups, Babel will generate a polyfill for the `.replace` method that has quadratic complexity on some specific replacement pattern strings (i.e. the second argument passed to `.replace`). Generated code is vulnerable if all the following conditions are true: Using Babel to compile regular expression named capturing groups, using the `.replace` method on a regular expression that contains named capturing groups, and the code using untrusted strings as the second argument of `.replace`. This problem has been fixed in `@babel/helpers` and `@babel/runtime` 7.26.10 and 8.0.0-alpha.17. It's likely that individual users do not directly depend on `@babel/helpers`, and instead depend on `@babel/core` (which itself depends on `@babel/helpers`). Upgrading to `@babel/core` 7.26.10 is not required, but it guarantees use of a new enough `@babel/helpers` version. Note that just updating Babel dependencies is not enough; one will also need to re-compile the code. No known workarounds are available.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: poc · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- babel babel
fixed in 7.26.10; From 8.0.0-alpha.0 · fixed in 8.0.0-alpha.17
- @babel/helpersnpm
fixed in 7.26.10
- @babel/runtimenpm
fixed in 7.26.10
- @babel/runtime-corejs2npm
fixed in 7.26.10
- @babel/runtime-corejs3npm
fixed in 7.26.10
- @babel/helpersnpm
From 8.0.0-alpha.0 · fixed in 8.0.0-alpha.17
- @babel/runtimenpm
From 8.0.0-alpha.0 · fixed in 8.0.0-alpha.17
- @babel/runtime-corejs2npm
From 8.0.0-alpha.0 · fixed in 8.0.0-alpha.17
- @babel/runtime-corejs3npm
From 8.0.0-alpha.0 · fixed in 8.0.0-alpha.17