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Vulnerability record · CVE-2026-47783 · published 20 May 2026

CVE-2026-47783: Memcached vulnerability

MMemcached · Memcached

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.

8.1 CVSS 3.1 High EPSS 1.3% · top 31.5% CWE-208 · CWE-208
8.1CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
18 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed Patch
https://github.com/memcached/memcached/compare/1.6.41...1.6.42 Release Notes
https://github.com/memcached/memcached/wiki/ReleaseNotes1642 Release Notes
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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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46853Memcached vulnerabilityIn Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used instead of \r\n.EPSS 0.76%9.8CVE-2016-8704Memcached integer overflow vulnerabilityAn integer overflow in the process_bin_append_prepend function in Memcached, which is responsible for processing multiple commands of Memcached binar…EPSS 23%9.8CVE-2016-8705Memcached integer overflow vulnerabilityMultiple integer overflows in process_bin_update function in Memcached, which is responsible for processing multiple commands of Memcached binary pro…EPSS 20%8.1CVE-2026-47784Memcached vulnerabilityIn memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl_server_u…EPSS 0.55%8.1CVE-2016-8706Memcached binary protocol SASL auth integer overflow leads to RCEAn integer overflow in the process_bin_sasl_auth function, which handles authentication commands in the Memcached binary protocol, can cause a heap o…EPSS 46%analysed7.5CVE-2023-46852Memcached classic buffer overflow vulnerabilityIn Memcached before 1.6.22, a buffer overflow exists when processing multiget requests in proxy mode, if there are many spaces after the "get" substr…EPSS 0.78%7.5CVE-2022-48571Memcached uncontrolled resource consumption vulnerabilitymemcached 1.6.7 allows a Denial of Service via multi-packet uploads in UDP.EPSS 1.1%7.5CVE-2020-22570Memcached command injection vulnerabilityMemcached 1.6.0 before 1.6.3 allows remote attackers to cause a denial of service (daemon crash) via a crafted meta command.EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-47783), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.