In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4601-1 memcached security update
Ubuntu USN Ubuntu USN USN-8320-1 Memcached vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 28 May 2026 00:15:00 +0000

Type Values Removed Values Added
Title Timing Side‑Channel in SASL Username Lookup Causes Username Enumeration in Memcached memcached: memcached: Username enumeration via timing side channel
References
Metrics threat_severity

None

threat_severity

Important


Wed, 20 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 20 May 2026 08:15:00 +0000

Type Values Removed Values Added
Title Timing Side‑Channel in SASL Username Lookup Causes Username Enumeration in Memcached

Wed, 20 May 2026 06:30:00 +0000

Type Values Removed Values Added
Description In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.
First Time appeared Memcached
Memcached memcached
Weaknesses CWE-208
CPEs cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*
Vendors & Products Memcached
Memcached memcached
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-20T12:49:58.195Z

Reserved: 2026-05-20T05:43:46.363Z

Link: CVE-2026-47783

cve-icon Vulnrichment

Updated: 2026-05-20T12:49:54.179Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-20T07:16:15.533

Modified: 2026-05-21T17:06:40.670

Link: CVE-2026-47783

cve-icon Redhat

Severity : Important

Publid Date: 2026-05-20T05:43:46Z

Links: CVE-2026-47783 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T08:00:11Z

Weaknesses