CVE-2026-47783

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-20 · updated 2026-09-18
Weakness: CWE-208

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

Memcached: before 1.6.42 — fixed in 1.6.42

How to fix

Upgrade to a fixed version: Memcached 1.6.42. Check the vendor advisory for mitigations.

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/errata/RHSA-2026:27842
https://access.redhat.com/errata/RHSA-2026:27862
https://access.redhat.com/security/cve/CVE-2026-47783
https://bugzilla.redhat.com/show_bug.cgi?id=2480089
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47783.json

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