CVE-2025-27789

MEDIUMNVD 6.26.2—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.2 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.2
EG Score
6.2(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity62% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
38.5%
KEV
Not listed

Published

March 11, 2025

Last Modified

April 15, 2026

References (2)

Affected Packages

(4 across 1 ecosystem)
npm(4)
PackageVulnerable rangeFixed inDependents
@babel/helpers—8.0.0-alpha.17—
@babel/runtime—8.0.0-alpha.17—
@babel/runtime-corejs2—8.0.0-alpha.17—
@babel/runtime-corejs3—8.0.0-alpha.17—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-07-23 02:52 UTCEG score recompute
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Frequently asked(5)

What is CVE-2025-27789?
CVE-2025-27789 is a medium vulnerability published on March 11, 2025. 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…
When was CVE-2025-27789 disclosed?
CVE-2025-27789 was first published in the National Vulnerability Database on March 11, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-27789 actively exploited?
CVE-2025-27789 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-27789?
CVE-2025-27789 has a CVSS v3 base score of 6.2 (NVD).
How do I remediate CVE-2025-27789?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-27789, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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