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CVE-2026-47784

36
FAUCET Score

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.

First published: May 20, 2026Last modified: May 20, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.42CPE matchmatch criteria
cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*
>= 0, < 1.6.42CPE match
cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 16th percentile among its peer group of 8,915 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 21347-17084Fixed in: 1.6.27-5
microsoftpatch availablevia msrc
Product: azl3 memcached 1.6.27-4 on Azure Linux 3.0Fixed in: 1.6.27-5
ubuntupatch availablevia ubuntu_usn
Product: memcached (resolute)Fixed in: 1.6.40-1ubuntu0.1
ubuntupatch availablevia ubuntu_usn
Product: memcached (questing)Fixed in: 1.6.38-1ubuntu0.1
ubuntupatch availablevia ubuntu_usn
Product: memcached (jammy)Fixed in: 1.6.14-1ubuntu0.2
ubuntupatch availablevia ubuntu_usn
Product: memcached (noble)Fixed in: 1.6.24-1ubuntu0.1

Vendor Advisories (2)

ubuntuUSN-8320-1

Memcached vulnerabilities

May 27, 2026
microsoft2026-May/CVE-2026-47784Important

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.

May 12, 2026

References

github.com / memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed
Patch
github.com / memcached/memcached/compare/1.6.41...1.6.42
Release Notes
github.com / memcached/memcached/wiki/ReleaseNotes1642
Release Notes