Is there a public exploit for CVE-2025-27789?

No public exploit for CVE-2025-27789 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2025-27789?

CVE-2025-27789 scores CVSS 6.2 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.56%.

What does CVE-2025-27789 affect?

CVE-2025-27789 affects babel Babel.

6.2 Medium

Babel is a compiler for writing next generation JavaScript.

CVE-2025-27789

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.

Assessment

CVSS: 6.2 (v3.1)
Severity: Medium
EPSS: 0.56% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 11 March 2025
Last updated: 17 June 2026
Affected: babel · Babel
Weakness: CWE-1333
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

At the source

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