---
title: "CVE-2026-33151\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-33151?format=md
keywords: index, follow
---

# CVE-2026-33151

Publication date 20 March 2026

Last updated 10 July 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-33151?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| node-socket.io-parser | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-33151?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-33151?format=md)

**Base score**

8.7 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | High |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.7 · High |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** 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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33151)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-33151)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-33151)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-33151)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-33151>
* <https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9>
* <https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4>
* <https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf>
* <https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78>