CVE-2026-47783

memcached: memcached: Username enumeration via timing side channel

Published May 20, 2026 CVSS 3.1 · 8.1 High EPSS 1.3% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4601-1 memcached security update
Debian DLA Debian DLA DLA-4791-1 memcached security update
Ubuntu USN Ubuntu USN USN-8320-1 Memcached vulnerabilities
History
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

Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 18, 2026, 12:04 PM
Reserved
May 20, 2026, 5:43 AM
Status
Modified
Published
May 20, 2026, 7:16 AM
Modified
Sep 18, 2026, 1:18 PM
Severity
Important
Public date
May 20, 2026, 5:43 AM