CVE-2023-37899

feathersjs socket handler allows abusing implicit toString

HIGH
7.5
CVSS Score
Published: July 19, 2023 at 07:45 PM UTC
Updated: June 17, 2026 at 06:08 AM UTC
1 product affected across 1 vendorFeathers

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.5.18v < 5.0.85.0.0 ≤ v < 5.0.8
Affected range stops below 4.5.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754

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