# 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-47784
- Priority: High
- CVSS: 8.1 (Important)
- EPSS: 0.0055
- 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-2026-47784

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | memcached Debian 12.15 (bookworm) | 1.6.18-1+deb12u1 | [DEBIAN-CVE-2026-47784](https://patchblox.com/security/data/fix/linux/debian-cve-2026-47784.md) | May 20, 2026 |
| Linux | memcached Debian 14 | 1.6.42-1 | [DEBIAN-CVE-2026-47784](https://patchblox.com/security/data/fix/linux/debian-cve-2026-47784.md) | May 20, 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 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 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 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 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.