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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| memcached | memcached | < 1.6.42 | 1.6.42 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | memcached | 1.6.42-1 | — |
| Debian 13 | memcached | No fix yet | — |
| Debian 12 | memcached | 1.6.18-1+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | memcached | 1.6.40-1ubuntu0.1 | — |
| Ubuntu 25.10 | memcached | 1.6.38-1ubuntu0.1 | — |
| Ubuntu 24.04 LTS | memcached | 1.6.24-1ubuntu0.1 | — |
| Ubuntu 22.04 LTS | memcached | 1.6.14-1ubuntu0.2 | — |
| Ubuntu 20.04 LTS | memcached | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | memcached | No fix yet | — |
| Ubuntu Pro 16.04 LTS | memcached | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | memcached +1 | 1.6.23-7.el10_2.1 | RHSA-2026:27842 |
| RHEL 9 | memcached +1 | 1.6.9-7.el9_8.1 | RHSA-2026:27862 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | memcached +2 | 1.6.45-1.hum1 | RHSA-2026:63224 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | memcached +1 | 1.6.23-7.el10_2.1 | ALSA-2026:27842 |
| AlmaLinux 9 | memcached +1 | 1.6.9-7.el9_8.1 | ALSA-2026:27862 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | memcached | 1.6.23-7.el10_2.1 | RLSA-2026:27842 |
| Rocky Linux 9 | memcached | 1.6.9-7.el9_8.1 | RLSA-2026:27862 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | memcached | 1.6.38-160000.3.1 | SUSE-SU-2026:22022-1 |
| SLES 16.0 | memcached | 1.6.38-160000.3.1 | SUSE-SU-2026:22022-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | memcached | 1.6.42-1.1 | openSUSE-SU-2026:10882-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | memcached +2 | 1.6.42-2.amzn2023.0.1 | ALAS2023-2026-1781 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | memcached | 1.6.27-5 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | memcached +1 | 1.6.23-7.el10_2.1 | ELSA-2026-27842 |
| Oracle Linux 9 | memcached +1 | 1.6.9-7.el9_8.1 | ELSA-2026-27862 |
Advisories 13
- ALSA-2026:27862 Important: memcached security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27842 Important: memcached security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-1615 memcached: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Sep 22, 2026
- RHSA-2026:63224 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:27862 Red Hat Security Advisory: memcached security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:27842 Red Hat Security Advisory: memcached security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- ELSA-2026-27842 Important: memcached security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- RLSA-2026:27862 Important: memcached security update Rocky Linux Security Advisories · Jun 24, 2026
- RLSA-2026:27842 Important: memcached security update Rocky Linux Security Advisories · Jun 24, 2026
- ELSA-2026-27862 Important: memcached security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- SUSE-SU-2026:22022-1 Security update for memcached SUSE / openSUSE Security Updates · Jun 9, 2026
- ALAS2023-2026-1781 Moderate: memcached security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- openSUSE-SU-2026:10882-1 memcached-1.6.42-1.1 on GA media SUSE / openSUSE Security Updates · May 29, 2026