PT-2026-26200 · Socket.Io · Socket.Io

X4Cc3 · Published 2026-03-18 · Updated 2026-03-21 · CVE-2026-33151

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Socket.IO versions prior to 3.3.5 Socket.IO versions 3.3.5 through 3.4.4 Socket.IO versions 4.0.0 through 4.2.6

Description Socket.IO is a real-time, bidirectional, event-based communication framework. A specially crafted Socket.IO packet can cause the server to wait for and buffer a large number of binary attachments, potentially leading to server memory exhaustion.

Recommendations Versions prior to 3.3.5: Upgrade to version 3.3.5 or later. Versions 3.3.5 through 3.4.4: Upgrade to version 3.4.4 or later. Versions 4.0.0 through 4.2.6: Upgrade to version 4.2.6 or later.

Exploit

Fix

RCE

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-20

CWE-754

Related Identifiers

CVE-2026-33151

GHSA-677M-J7P3-52F9

Affected Products

Socket.Io

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33151.json · Exploit
• https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78 · Patch
• https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9 · Vendor Advisory
• https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf · Patch
• https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4 · Patch
• https://osv.dev/vulnerability/GHSA-677m-j7p3-52f9 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33151 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33151 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33151 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-33151 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33151 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33151 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33151 · Vendor Advisory
• https://github.com/socketio/socket.io · Note
• https://twitter.com/CVEnew/status/2035262157630189714 · Twitter Post