---
title: "CVE-2026-47784\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-2026-47784?format=md
keywords: index, follow
---

# CVE-2026-47784

Publication date 20 May 2026

Last updated 27 May 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-47784?format=md#impact-score)

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## Description

In memcached before 1.6.42, password data for SASL password database
authentication has a timing side channel because memcmp is used by
sasl\_server\_userdb\_checkpass.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-47784?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| memcached | 26.04 LTS resolute | Fixed 1.6.40-1ubuntu0.1 |
| 25.10 questing | Fixed 1.6.38-1ubuntu0.1 |
| 24.04 LTS noble | Fixed 1.6.24-1ubuntu0.1 |
| 22.04 LTS jammy | Fixed 1.6.14-1ubuntu0.2 |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | 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)
* [Patch details](https://ubuntu.com/security/CVE-2026-47784?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

same commit as CVE-2026-47783

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| memcached | * Upstream:   [d13f282](https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-47784)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-47784)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-47784)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-47784)

### Related Ubuntu Security Notices (USN)

+ [USN-8320-1](https://usn.ubuntu.com/USN-8320-1)
+ Memcached vulnerabilities
+ 27 May 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-47784>
* <https://github.com/memcached/memcached/compare/1.6.41...1.6.42>
* <https://github.com/memcached/memcached/wiki/ReleaseNotes1642>