SB2026052674 - Two vulnerabilities in Memcached SASL implementation

Description

This security bulletin contains information about 2 vulnerabilities.

1) Information Exposure Through Timing Discrepancy (CVE-ID: CVE-2026-47783)

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to disclose valid usernames.

The vulnerability exists due to observable timing discrepancies in sasl_server_userdb_checkpass when processing SASL password database authentication requests. A remote user can send authentication attempts and measure response times to disclose valid usernames.

2) Information Exposure Through Timing Discrepancy (CVE-ID: CVE-2026-47784)

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to disclose password information via a timing side channel.

The vulnerability exists due to observable timing discrepancies in sasl_server_userdb_checkpass when comparing SASL password database authentication data. A remote user can send authentication attempts and measure response times to disclose password information via a timing side channel.

Remediation

Install update from vendor's website.

References

• https://www.openwall.com/lists/oss-security/2026/05/24/7
• https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed