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.
CVE-2026-47783 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.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| memcached · Debian 12.15 (bookworm) | 1.6.18-1+deb12u1 | DEBIAN-CVE-2026-47783 | May 20, 2026 |
| memcached · Debian 14 | 1.6.42-1 | DEBIAN-CVE-2026-47783 | May 20, 2026 |
| memcached · RHEL 10 | 1.6.23-7.el10_2.1 | RHSA-2026:27842 | May 20, 2026 |
| memcached · RHEL 9 | 0:1.6.9-7.el9_8.1 | RHSA-2026:27862 | Jun 24, 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 · almalinux 10 | 1.6.23-7.el10_2.1 | ALSA-2026:27842 | Jun 22, 2026 |
| memcached · almalinux 9 | 1.6.9-7.el9_8.1 | ALSA-2026:27862 | Jun 22, 2026 |
| memcached · amzn 2023 | 1.6.42-2.amzn2023.0.1 | ALAS2023-2026-1781 | Jun 8, 2026 |
| memcached · ol 10 | 0:1.6.23-7.el10_2.1 | ELSA-2026-27842 | Jul 16, 2026 |
| memcached · ol 9 | 0:1.6.9-7.el9_8.1 | ELSA-2026-27862 | Jun 23, 2026 |
| memcached · rocky 10 | 0:1.6.23-7.el10_2.1 | RLSA-2026:27842 | Jun 24, 2026 |
| memcached · rocky 9 | 0:1.6.9-7.el9_8.1 | RLSA-2026:27862 | Jun 24, 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 · RHEL 9 | 0:1.6.9-7.el9_8.1 | RHSA-2026:27862 | Jun 24, 2026 |
| memcached-selinux · almalinux 10 | 1.6.23-7.el10_2.1 | ALSA-2026:27842 | Jun 22, 2026 |
| memcached-selinux · almalinux 9 | 1.6.9-7.el9_8.1 | ALSA-2026:27862 | Jun 22, 2026 |
| memcached-selinux · amzn 2023 | 1.6.42-2.amzn2023.0.1 | ALAS2023-2026-1781 | Jun 8, 2026 |
| memcached-selinux · ol 10 | 0:1.6.23-7.el10_2.1 | ELSA-2026-27842 | Jul 16, 2026 |
| memcached-selinux · ol 9 | 0:1.6.9-7.el9_8.1 | ELSA-2026-27862 | Jun 23, 2026 |
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