# CVE-2026-47783: 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. - Web page: https://patchblox.com/security/cve/CVE-2026-47783 - Priority: High - CVSS: 8.1 (Important) - EPSS: 0.0126 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 20, 2026 - Weakness: Observable Timing Discrepancy - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47783 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | memcached Debian 12.15 (bookworm) | 1.6.18-1+deb12u1 | [DEBIAN-CVE-2026-47783](https://patchblox.com/security/data/fix/linux/debian-cve-2026-47783.md) | May 20, 2026 | | Linux | memcached Debian 14 | 1.6.42-1 | [DEBIAN-CVE-2026-47783](https://patchblox.com/security/data/fix/linux/debian-cve-2026-47783.md) | May 20, 2026 | | Linux | memcached RHEL 10 | 1.6.23-7.el10_2.1 | [RHSA-2026:27842](https://patchblox.com/security/data/fix/linux/rhsa-2026-27842.md) | May 20, 2026 | | Linux | memcached RHEL 9 | 0:1.6.9-7.el9_8.1 | [RHSA-2026:27862](https://patchblox.com/security/data/fix/linux/rhsa-2026-27862.md) | Jun 24, 2026 | | Linux | memcached Ubuntu 22.04.1 LTS (jammy) | 1.6.14-1ubuntu0.2 | [memcached 1.6.14-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-memcached-1.6.14-1ubuntu0.2.md) | May 20, 2026 | | Linux | memcached Ubuntu 24.04.5 LTS (noble) | 1.6.24-1ubuntu0.1 | [memcached 1.6.24-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-memcached-1.6.24-1ubuntu0.1.md) | May 20, 2026 | | Linux | memcached Ubuntu 25.10 (questing) | 1.6.38-1ubuntu0.1 | [memcached 1.6.38-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-memcached-1.6.38-1ubuntu0.1.md) | May 20, 2026 | | Linux | memcached Ubuntu 26.04.1 LTS (resolute) | 1.6.40-1ubuntu0.1 | [memcached 1.6.40-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-memcached-1.6.40-1ubuntu0.1.md) | May 20, 2026 | | Linux | memcached almalinux 10 | 1.6.23-7.el10_2.1 | [ALSA-2026:27842](https://patchblox.com/security/data/fix/linux/alsa-2026-27842.md) | Jun 22, 2026 | | Linux | memcached almalinux 9 | 1.6.9-7.el9_8.1 | [ALSA-2026:27862](https://patchblox.com/security/data/fix/linux/alsa-2026-27862.md) | Jun 22, 2026 | | Linux | memcached amzn 2023 | 1.6.42-2.amzn2023.0.1 | [ALAS2023-2026-1781](https://patchblox.com/security/data/fix/linux/alas2023-2026-1781.md) | Jun 8, 2026 | | Linux | memcached ol 10 | 0:1.6.23-7.el10_2.1 | [ELSA-2026-27842](https://patchblox.com/security/data/fix/linux/elsa-2026-27842.md) | Jul 16, 2026 | | Linux | memcached ol 9 | 0:1.6.9-7.el9_8.1 | [ELSA-2026-27862](https://patchblox.com/security/data/fix/linux/elsa-2026-27862.md) | Jun 23, 2026 | | Linux | memcached rocky 10 | 0:1.6.23-7.el10_2.1 | [RLSA-2026:27842](https://patchblox.com/security/data/fix/linux/rlsa-2026-27842.md) | Jun 24, 2026 | | Linux | memcached rocky 9 | 0:1.6.9-7.el9_8.1 | [RLSA-2026:27862](https://patchblox.com/security/data/fix/linux/rlsa-2026-27862.md) | Jun 24, 2026 | | Linux | memcached sles 16.0 | 1.6.38-160000.3.1 | [SUSE-SU-2026:22022-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22022-1.md) | Jun 2, 2026 | | Linux | memcached-debuginfo amzn 2023 | 1.6.42-2.amzn2023.0.1 | [ALAS2023-2026-1781](https://patchblox.com/security/data/fix/linux/alas2023-2026-1781.md) | Jun 8, 2026 | | Linux | memcached-debugsource amzn 2023 | 1.6.42-2.amzn2023.0.1 | [ALAS2023-2026-1781](https://patchblox.com/security/data/fix/linux/alas2023-2026-1781.md) | Jun 8, 2026 | | Linux | memcached-devel amzn 2023 | 1.6.42-2.amzn2023.0.1 | [ALAS2023-2026-1781](https://patchblox.com/security/data/fix/linux/alas2023-2026-1781.md) | Jun 8, 2026 | | Linux | memcached-selinux RHEL 9 | 0:1.6.9-7.el9_8.1 | [RHSA-2026:27862](https://patchblox.com/security/data/fix/linux/rhsa-2026-27862.md) | Jun 24, 2026 | | Linux | memcached-selinux almalinux 10 | 1.6.23-7.el10_2.1 | [ALSA-2026:27842](https://patchblox.com/security/data/fix/linux/alsa-2026-27842.md) | Jun 22, 2026 | | Linux | memcached-selinux almalinux 9 | 1.6.9-7.el9_8.1 | [ALSA-2026:27862](https://patchblox.com/security/data/fix/linux/alsa-2026-27862.md) | Jun 22, 2026 | | Linux | memcached-selinux amzn 2023 | 1.6.42-2.amzn2023.0.1 | [ALAS2023-2026-1781](https://patchblox.com/security/data/fix/linux/alas2023-2026-1781.md) | Jun 8, 2026 | | Linux | memcached-selinux ol 10 | 0:1.6.23-7.el10_2.1 | [ELSA-2026-27842](https://patchblox.com/security/data/fix/linux/elsa-2026-27842.md) | Jul 16, 2026 | | Linux | memcached-selinux ol 9 | 0:1.6.9-7.el9_8.1 | [ELSA-2026-27862](https://patchblox.com/security/data/fix/linux/elsa-2026-27862.md) | Jun 23, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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