Vulnerability · Published May 20, 2026 · Assigned by mitre
CVE-2026-47783
High 8.1
In plain English
A high-severity security flaw in memcached from memcached. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)1.3%top 30.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | memcached | 1.6.23-7.el10_2.1 | ALSA-2026:27842 |
| AlmaLinux:9 | memcached | 1.6.9-7.el9_8.1 | ALSA-2026:27862 |
| AlmaLinux:10 | memcached-selinux | 1.6.23-7.el10_2.1 | ALSA-2026:27842 |
| AlmaLinux:9 | memcached-selinux | 1.6.9-7.el9_8.1 | ALSA-2026:27862 |
| Debian:12 | memcached | 1.6.18-1+deb12u1 | DEBIAN-CVE-2026-47783 |
| Debian:13 | memcached | no fix listed | DEBIAN-CVE-2026-47783 |
| Debian:14 | memcached | 1.6.42-1 | DEBIAN-CVE-2026-47783 |
| Rocky Linux:10 | memcached | 0:1.6.23-7.el10_2.1 | RLSA-2026:27842 |
| Rocky Linux:9 | memcached | 0:1.6.9-7.el9_8.1 | RLSA-2026:27862 |
| Ubuntu:22.04:LTS | memcached | 1.6.14-1ubuntu0.2 | UBUNTU-CVE-2026-47783 |
| Ubuntu:24.04:LTS | memcached | 1.6.24-1ubuntu0.1 | UBUNTU-CVE-2026-47783 |
| Ubuntu:25.10 | memcached | 1.6.38-1ubuntu0.1 | UBUNTU-CVE-2026-47783 |
| Ubuntu:26.04:LTS | memcached | 1.6.40-1ubuntu0.1 | UBUNTU-CVE-2026-47783 |
Affected products (as reported)
Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed
- https://github.com/memcached/memcached/compare/1.6.41...1.6.42
- https://github.com/memcached/memcached/wiki/ReleaseNotes1642
- https://access.redhat.com/security/cve/CVE-2026-47783 vdb-entry, x_refsource_REDHAT
- RHBZ#2480089 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47783.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:27842 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:27862 vendor-advisory, x_refsource_REDHAT