{"id":"CVE-2025-27789","state":"PUBLISHED","title":"Inefficient RexExp complexity in generated code with .replace when transpiling named capturing groups","description":"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.","publishedAt":"2025-03-11T19:09:28.146Z","updatedAt":"2025-03-11T19:53:42.811Z","severity":{"score":6.2,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["babel babel"],"affected":[{"vendor":"babel","product":"babel","versions":[{"version":"< 7.26.10","status":"affected"},{"version":">= 8.0.0-alpha.0, < 8.0.0-alpha.17","status":"affected"}]}],"references":["https://github.com/babel/babel/security/advisories/GHSA-968p-4wvh-cqc8","https://github.com/babel/babel/pull/17173"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:08:47.682Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/27xxx/CVE-2025-27789.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-27789","state":"PUBLISHED","datePublished":"2025-03-11T19:09:28.146Z","dateUpdated":"2025-03-11T19:53:42.811Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-03-06T18:06:54.462Z"},"containers":{"cna":{"title":"Inefficient RexExp complexity in generated code with .replace when transpiling named capturing groups","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"babel","product":"babel","versions":[{"version":"< 7.26.10","status":"affected"},{"version":">= 8.0.0-alpha.0, < 8.0.0-alpha.17","status":"affected"}]}],"references":[{"url":"https://github.com/babel/babel/security/advisories/GHSA-968p-4wvh-cqc8","name":"https://github.com/babel/babel/security/advisories/GHSA-968p-4wvh-cqc8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/babel/babel/pull/17173","name":"https://github.com/babel/babel/pull/17173","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-03-11T19:09:28.146Z"},"source":{"advisory":"GHSA-968p-4wvh-cqc8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-03-11T19:53:22.902147Z","id":"CVE-2025-27789","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-03-11T19:53:42.811Z"}}]}}}