CVE-2026-47783

Summary

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 Software

Weaknesses

• CWE-208: CWE-208 Observable Timing Discrepancy

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

memcached: memcached: Username enumeration via timing side channel

Additional References

• 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
• https://access.redhat.com/errata/RHSA-2026:27842
• https://access.redhat.com/errata/RHSA-2026:27862

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

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