CVE-2025-50537Public exploit

Development-test error via unchecked circular recursion

Published Jan 26, 2026 · Updated Jan 26, 2026

Uncontrolled recursion in ESLint before 9.26.0 allows local users to trigger a RuleTester error with a circular test-case object. During duplicate-test validation, checkDuplicateTestCase() passes the object to isSerializable(), which recursively traverses it without cycle detection. GitHub withdrew the advisory because RuleTester runs only during rule development and the condition raises an error rather than crashing an application.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in ESLint before 9.26.0 allows local users to trigger a RuleTester error with a circular test-case object. During duplicate-test validation, checkDuplicateTestCase() passes the object to isSerializable(), which recursively traverses it without cycle detection. GitHub withdrew the advisory because RuleTester runs only during rule development and the condition raises an error rather than crashing an application.

The record

CVE
CVE-2025-50537
Published
Jan 26, 2026
Updated
Jan 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-674
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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