CVE-2026-47784

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.

CVE-2026-47784 is fixed in 5 products on 1 platform, first by memcached 1.6.14-1ubuntu0.2, released May 20, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.1

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0055

46th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
memcached · Debian 12.15 (bookworm)	1.6.18-1+deb12u1	DEBIAN-CVE-2026-47784	May 20, 2026
memcached · Debian 14	1.6.42-1	DEBIAN-CVE-2026-47784	May 20, 2026
memcached · Ubuntu 22.04.1 LTS (jammy)	1.6.14-1ubuntu0.2	memcached 1.6.14-1ubuntu0.2	May 20, 2026
memcached · Ubuntu 24.04.5 LTS (noble)	1.6.24-1ubuntu0.1	memcached 1.6.24-1ubuntu0.1	May 20, 2026
memcached · Ubuntu 25.10 (questing)	1.6.38-1ubuntu0.1	memcached 1.6.38-1ubuntu0.1	May 20, 2026
memcached · Ubuntu 26.04.1 LTS (resolute)	1.6.40-1ubuntu0.1	memcached 1.6.40-1ubuntu0.1	May 20, 2026
memcached · amzn 2023	1.6.42-2.amzn2023.0.1	ALAS2023-2026-1781	Jun 8, 2026
memcached · sles 16.0	1.6.38-160000.3.1	SUSE-SU-2026:22022-1	Jun 2, 2026
memcached-debuginfo · amzn 2023	1.6.42-2.amzn2023.0.1	ALAS2023-2026-1781	Jun 8, 2026
memcached-debugsource · amzn 2023	1.6.42-2.amzn2023.0.1	ALAS2023-2026-1781	Jun 8, 2026
memcached-devel · amzn 2023	1.6.42-2.amzn2023.0.1	ALAS2023-2026-1781	Jun 8, 2026
memcached-selinux · amzn 2023	1.6.42-2.amzn2023.0.1	ALAS2023-2026-1781	Jun 8, 2026

Details

Published
May 20, 2026
Weakness
Observable Timing Discrepancy
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47784

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