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CVE-2023-37899

feathersjs socket handler allows abusing implicit toString

7.5 HighFix available

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like const message = ${{ toString: '' }} which would cause the NodeJS process to crash when sending an unexpected Socket.io message like socket.emit('find', { toString: '' }). A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.19%Up 1.1 points since Jul 20, 2023
90%50%10%1%

What each source reports

CVE List Score used 7.5

feathersjs socket handler allows abusing implicit toString

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like const message = ${{ toString: '' }} which would cause the NodeJS process to crash when sending an unexpected Socket.io message like socket.emit('find', { toString: '' }). A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Record
CVE-2023-37899
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-754
Updated
2026-11-02
EUVDEUVD-2023-2077 7.5

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like const message = ${{ toString: '' }} which would cause the NodeJS process to crash when sending an unexpected Socket.io message like socket.emit('find', { toString: '' }). A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Record
EUVD-2023-2077
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-hhr9-rh25-hvf9 7.5

Feathers socket handler allows abusing implicit toString

Impact

Feathers socket handler did not catch invalid string conversion errors like:

const message = `${{ toString: '' }}`

Causing the NodeJS process to crash when sending an unexpected Socket.io message like

socket.emit('find', { toString: '' })

Patches

A fix has been released in

  • v5.0.8 via #3241
  • v4.5.18 via #3242

Workarounds

Since it is in the core Socket handling code upgrading to the latest version is necessary.

References

Record
GHSA-hhr9-rh25-hvf9
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-754
Updated
2026-11-02
NVD 7.5

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like const message = ${{ toString: '' }} which would cause the NodeJS process to crash when sending an unexpected Socket.io message like socket.emit('find', { toString: '' }). A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Record
CVE-2023-37899
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-754
Updated
2026-11-02
OSV 7.5

feathersjs socket handler allows abusing implicit toString

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like const message = ${{ toString: '' }} which would cause the NodeJS process to crash when sending an unexpected Socket.io message like socket.emit('find', { toString: '' }). A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Record
CVE-2023-37899
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-754
Updated
2026-11-02
OSVGHSA-hhr9-rh25-hvf9 7.5

Feathers socket handler allows abusing implicit toString

Impact

Feathers socket handler did not catch invalid string conversion errors like:

const message = `${{ toString: '' }}`

Causing the NodeJS process to crash when sending an unexpected Socket.io message like

socket.emit('find', { toString: '' })

Patches

A fix has been released in

  • v5.0.8 via #3241
  • v4.5.18 via #3242

Workarounds

Since it is in the core Socket handling code upgrading to the latest version is necessary.

References

Record
GHSA-hhr9-rh25-hvf9
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-754
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
@feathersjs/socketio
npm
 through 4.5.17
4.5.18
@feathersjs/socketio
npm
 5.0.0 to 5.0.7
5.0.8
@feathersjs/transport-commons
npm
 through 4.5.17
4.5.18
@feathersjs/transport-commons
npm
 5.0.0 to 5.0.7
5.0.8
@feathersjs/socketio
npm
 before 4.5.18
4.5.18
@feathersjs/socketio
npm
 5.0.0 up to 5.0.8
5.0.8
@feathersjs/transport-commons
npm
 before 4.5.18
4.5.18
@feathersjs/transport-commons
npm
 5.0.0 up to 5.0.8
5.0.8

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-37899 is a high vulnerability (CVSS 7.5) in Feathersjs Feathers, published July 19, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.19%, the 68th percentile. Fixed in @feathersjs/socketio 4.5.18.

References

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