NodeBB Pre-Authentication Denial-of-Service

published 2023-09-29 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-34971

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 58.7%; EPSS 58.7% chance of exploitation in 30 days, percentile 99.1%
public exploits: 0; none known

Denial-of-service in NodeBB <= v2.8.10 allows unauthenticated attackers to trigger a crash, when invoking `eventName.startsWith()` or `eventName.toString()`, while processing Socket.IO messages via crafted Socket.IO messages containing array or object type for the event name respectively.

Patch / fix

links 3

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-09-23)

Exploit prediction

58.69% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

NodeBB, Inc. NodeBB

Classification

Weakness

CWE-241 Improper Handling of Unexpected Data Type
CWE-754 Improper Check for Unusual or Exceptional Conditions

References

github.com /NodeBB/NodeBB/commit/37b48b82a4bc7680c6e4c42647209010cb239c2c
patch
github.com /NodeBB/NodeBB/commit/830f142b7aea2e597294a84d52c05aab3a3539ca
patch
github.com /NodeBB/NodeBB/commit/4d2d76897a02e7068ab74c81d17a2febfae8bfb9
patch
starlabs.sg /advisories/23/23-30591/
third-party-advisory

Sources

CVE List CVE-2023-30591
NVD CVE-2023-30591

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary