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.

An update of the memcached package has been released.

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-27862 advisory.

    - Fix timing side-channel in SASL password database authentication       (CVE-2026-47783)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:27862 advisory.

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:27842 advisory.

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 9 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:27862 advisory.

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:27842 advisory.

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:27842 advisory.

    memcached is a high-performance, distributed memory object caching system, generic in nature, but intended     for use in speeding up dynamic web applications by alleviating database load.

    Security Fix(es):

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:27862 advisory.

    memcached is a high-performance, distributed memory object caching system, generic in nature, but intended     for use in speeding up dynamic web applications by alleviating database load.

    Security Fix(es):

    * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2292-1 advisory.

    This update for memcached fixes the following issues

    - CVE-2026-47783: timing side-channel in SASL password database authentication (username) (bsc#1265873).
    - CVE-2026-47784: timing side-channel in SASL password database authentication (password) (bsc#1265881).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2293-1 advisory.

    This update for memcached fixes the following issues

    - CVE-2026-47783: timing side-channel in SASL password database authentication (username) (bsc#1265873).
    - CVE-2026-47784: timing side-channel in SASL password database authentication (password) (bsc#1265881).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1781 advisory.

    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.
    (CVE-2026-47783)

    In memcached before 1.6.42, password data for SASL password database authentication has a timing side     channel because memcmp is used by sasl_server_userdb_checkpass. (CVE-2026-47784)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8320-1 advisory.

    It was discovered that Memcached's SASL password database authentication had a timing side channel when     handling username and password data. A remote attacker could possibly use this issue to obtain sensitive     information.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4601 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4601-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                           Chris Lamb     May 26, 2026                                  https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : memcached     Version        : 1.6.9+dfsg-1+deb11u1     CVE IDs        : CVE-2026-47783 CVE-2026-47784     Debian Bug     : 1137214

    It was discovered that there were two side-channel attacks in     memcached, the popular in-memory key/value database store. This could     have been used to reveal or extract information about authentication     details.

    For Debian 11 bullseye, these problems have been fixed in version     1.6.9+dfsg-1+deb11u1.

    We recommend that you upgrade your memcached packages.

    For the detailed security status of memcached please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/memcached

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-47783)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
323388	Photon OS 5.0: Memcached PHSA-2026-5.0-0904	Nessus	PhotonOS Local Security Checks	high
323234	Photon OS 4.0: Memcached PHSA-2026-4.0-1043	Nessus	PhotonOS Local Security Checks	high
322813	Oracle Linux 9 : memcached (ELSA-2026-27862)	Nessus	Oracle Linux Local Security Checks	high
322539	RockyLinux 9 : memcached (RLSA-2026:27862)	Nessus	Rocky Linux Local Security Checks	high
322373	RockyLinux 10 : memcached (RLSA-2026:27842)	Nessus	Rocky Linux Local Security Checks	high
322292	AlmaLinux 9 : memcached (ALSA-2026:27862)	Nessus	Alma Linux Local Security Checks	high
322280	AlmaLinux 10 : memcached (ALSA-2026:27842)	Nessus	Alma Linux Local Security Checks	high
321965	RHEL 10 : memcached (RHSA-2026:27842)	Nessus	Red Hat Local Security Checks	high
321960	RHEL 9 : memcached (RHSA-2026:27862)	Nessus	Red Hat Local Security Checks	high
321068	SUSE SLES12 Security Update : memcached (SUSE-SU-2026:2292-1)	Nessus	SuSE Local Security Checks	high
321058	SUSE SLES15 Security Update : memcached (SUSE-SU-2026:2293-1)	Nessus	SuSE Local Security Checks	high
319765	Amazon Linux 2023 : memcached, memcached-devel, memcached-selinux (ALAS2023-2026-1781)	Nessus	Amazon Linux Local Security Checks	high
317476	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Memcached vulnerabilities (USN-8320-1)	Nessus	Ubuntu Local Security Checks	high
316829	Debian dla-4601 : memcached - security update	Nessus	Debian Local Security Checks	high
315754	Linux Distros Unpatched Vulnerability : CVE-2026-47783	Nessus	Misc.	high

Detections

Analytics

CVE-2026-47783

high

Tenable Plugins

high

high

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high

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