Medium
eslint — security advisory
Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow.
- Products
- eslint
- Affected versions
- 5.0.1~dfsg-4build2, 5.0.1~dfsg-4build3, 5.16.0~dfsg+~4.16.8-5, 5.16.0~dfsg+~4.16.8-6, 5.16.0~dfsg+~4.16.8-7, 5.16.0~dfsg+~4.16.8-8, 6.4.0~dfsg+~6.1.9-11build3, 6.4.0~dfsg+~6.1.9-12, 6.4.0~dfsg+~6.1.9-13, 6.4.0~dfsg+~6.1.9-14, 6.4.0~dfsg+~6.1.9-2, 6.4.0~dfsg+~6.1.9-7
- Fixed versions
- Not specified
- CVEs
- CVE-2025-50537
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:33 UTC · Revision 1
Source evidence
Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow.
osv:UBUNTU-CVE-2025-50537
eslint
Fixed versions: Not specified
eslint
Fixed versions: Not specified
eslint
Fixed versions: Not specified
eslint
Fixed versions: Not specified
eslint
Fixed versions: Not specified
eslint
Fixed versions: Not specified
Complete source record
{
"id": "51ede5a87527cac16339f8547fa5616eb3d6fc354a2ff5cd360e6ccdd31b0503",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-50537",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-50537",
"summary": "Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow.",
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"severity": "medium",
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"aliases": [
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"metrics": [
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"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
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"modified": "2026-10-17T12:57:06.129139644Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2025-50537",
"https://www.cve.org/CVERecord?id=CVE-2025-50537",
"https://github.com/eslint/eslint/issues/19646",
"https://gist.github.com/lyyffee/2ee1815e5c2da82c05e9838b9bfefbbc"
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"source_id": "core-osv",
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"published_at": "2026-01-26T16:15:00+00:00"
}