Is CVE-2026-33151 actively exploited?

No active exploitation of CVE-2026-33151 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33151 be exploited remotely?

Yes. CVE-2026-33151 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33151?

CVE-2026-33151 has a CVSS score of 8.7 (HIGH).

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HIGH

CVE-2026-33151

CWE-20Published: March 20, 2026· Updated: Mar 23, 2026

8.7

CVSS v3.1

EPSS:0.08%probability of exploitation in 30 daysPercentile:24.6th

Official Description

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.

NVD Source

Technical Analysis

CVE-2026-33151 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X