CVE catalog

CVE-2026-47783

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 catalog]

Severity
High · CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
Source
[NVD] · [CVE record]
EPSS
1.26% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianmemcachedsid1.6.45-1fixed
Debianmemcachedforky1.6.45-1fixed
Debianmemcachedtrixie1.6.38-1vulnerable
Debianmemcachedbookworm1.6.18-1vulnerable
Debianmemcachedbookworm-security1.6.18-1+deb12u1fixed
CpememcachedNot reported1.6.24-1ubuntu0.1fixed
CpememcachedNot reportedNot reportedvulnerable
CpememcachedNot reported1.6.42fixed
CpememcachedNot reported1.6.42fixed
Ubuntumemcachedpro1.4.33-1ubuntu3vulnerable
Ubuntumemcachedpro1.5.4-1ubuntu2vulnerable
Ubuntumemcachedpro1.5.4-1ubuntu3vulnerable
Ubuntumemcachedpro1.5.6-0ubuntu1vulnerable
Ubuntumemcachedpro1.5.6-0ubuntu1.1vulnerable
Ubuntumemcachedpro1.5.6-0ubuntu1.2vulnerable
Ubuntumemcachedpro1.5.6-0ubuntu1.2+esm1vulnerable
Ubuntumemcached20.041.5.10-0ubuntu3vulnerable
Ubuntumemcached20.041.5.10-0ubuntu4vulnerable
Ubuntumemcached20.041.5.19-2vulnerable
Ubuntumemcached20.041.5.20-1vulnerable
Ubuntumemcached20.041.5.22-1ubuntu1vulnerable
Ubuntumemcached20.041.5.22-2vulnerable
Ubuntumemcached20.041.5.22-2ubuntu0.1vulnerable
Ubuntumemcached20.041.5.22-2ubuntu0.2vulnerable
Ubuntumemcached20.041.5.22-2ubuntu0.3vulnerable
Ubuntumemcached22.041.6.9+dfsg-1build1vulnerable
Ubuntumemcached22.041.6.12+dfsg-2ubuntu1vulnerable
Ubuntumemcached22.041.6.12+dfsg-3vulnerable
Ubuntumemcached22.041.6.12+dfsg-4vulnerable
Ubuntumemcached22.041.6.13-1vulnerable
Ubuntumemcached22.041.6.14-1vulnerable
Ubuntumemcached22.041.6.14-1ubuntu0.1vulnerable
Ubuntumemcached22.041.6.14-1ubuntu0.2fixed
Ubuntumemcached24.041.6.21-1vulnerable
Ubuntumemcached24.041.6.22-1vulnerable
Ubuntumemcached24.041.6.23-1vulnerable
Ubuntumemcached24.041.6.24-1build1vulnerable
Ubuntumemcached24.041.6.24-1build3vulnerable
Ubuntumemcached24.041.6.24-1ubuntu0.1fixed
Ubuntumemcached25.101.6.37-1vulnerable
Ubuntumemcached25.101.6.38-1vulnerable
Ubuntumemcached25.101.6.38-1build1vulnerable
Ubuntumemcached25.101.6.38-1ubuntu0.1fixed
Ubuntumemcached26.041.6.38-1build1vulnerable
Ubuntumemcached26.041.6.39-2vulnerable
Ubuntumemcached26.041.6.40-1vulnerable
Ubuntumemcached26.041.6.40-1ubuntu0.1fixed
Ubuntumemcached22.041.6.9+dfsg-1build1vulnerable
Ubuntumemcached22.041.6.12+dfsg-2ubuntu1vulnerable
Ubuntumemcached22.041.6.12+dfsg-3vulnerable
Ubuntumemcached22.041.6.12+dfsg-4vulnerable
Ubuntumemcached22.041.6.13-1vulnerable
Ubuntumemcached22.041.6.14-1vulnerable
Ubuntumemcached22.041.6.14-1ubuntu0.1vulnerable
Ubuntumemcached22.041.6.14-1ubuntu0.2fixed
Ubuntumemcached24.041.6.21-1vulnerable
Ubuntumemcached24.041.6.22-1vulnerable
Ubuntumemcached24.041.6.23-1vulnerable
Ubuntumemcached24.041.6.24-1build1vulnerable
Ubuntumemcached24.041.6.24-1build3vulnerable
Ubuntumemcached24.041.6.24-1ubuntu0.1fixed
Ubuntumemcached25.101.6.37-1vulnerable
Ubuntumemcached25.101.6.38-1vulnerable
Ubuntumemcached25.101.6.38-1build1vulnerable
Ubuntumemcached25.101.6.38-1ubuntu0.1fixed
Ubuntumemcached26.041.6.38-1build1vulnerable
Ubuntumemcached26.041.6.39-2vulnerable
Ubuntumemcached26.041.6.40-1vulnerable
Ubuntumemcached26.041.6.40-1ubuntu0.1fixed
Susememcachedlinux enterprise server 16.01.6.38-160000.3.1fixed
Susememcachedlinux enterprise server for sap applications 16.01.6.38-160000.3.1fixed
Opensusememcachedtumbleweed1.6.42-1.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianmemcachedsourcesid1.6.42-1not yet assignedNot reported[1137214]
Debianmemcachedsourceforky1.6.42-1not yet assignedNot reported[1137214]
Debianmemcachedsourcetrixie(unfixed)not yet assignedNot reported[1137214]
Debianmemcachedsourcebookworm1.6.18-1+deb12u1not yet assignedNot reported[1137214]
CpememcachedcpeNot reported1.6.24-1ubuntu0.1Not reportedNot reportedNot reported
CpememcachedcpeNot reported1.6.42Not reportedNot reportedNot reported
CpememcachedcpeNot reported1.6.42Not reportedNVD-CVE-2026-47783Not reported
Ubuntumemcacheddeb22.041.6.14-1ubuntu0.2Not reportedUBUNTU-CVE-2026-47783Not reported
Ubuntumemcacheddeb24.041.6.24-1ubuntu0.1Not reportedUBUNTU-CVE-2026-47783Not reported
Ubuntumemcacheddeb25.101.6.38-1ubuntu0.1Not reportedUBUNTU-CVE-2026-47783Not reported
Ubuntumemcacheddeb26.041.6.40-1ubuntu0.1Not reportedUBUNTU-CVE-2026-47783Not reported
Ubuntumemcacheddeb22.041.6.14-1ubuntu0.2Not reportedUSN-8320-1Not reported
Ubuntumemcacheddeb24.041.6.24-1ubuntu0.1Not reportedUSN-8320-1Not reported
Ubuntumemcacheddeb25.101.6.38-1ubuntu0.1Not reportedUSN-8320-1Not reported
Ubuntumemcacheddeb26.041.6.40-1ubuntu0.1Not reportedUSN-8320-1Not reported
Susememcachedrpmlinux enterprise server 16.01.6.38-160000.3.1Not reportedSUSE-SU-2026:22022-1Not reported
Susememcachedrpmlinux enterprise server for sap applications 16.01.6.38-160000.3.1Not reportedSUSE-SU-2026:22022-1Not reported
Opensusememcachedrpmtumbleweed1.6.42-1.1Not reportedOPENSUSE-SU-2026:10882-1Not reported

[Debian bug #1137214]

Notes

[trixie] memcached: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [memcached]Affected
    Details (2)

    • 1.6.18-1 · amd64 · bookworm

      Affected · Fixed: 1.6.18-1+deb12u1

      nvd · memcached · debian · bookworm; nvd · memcached · debian · 12

    • 1.6.18-1 · arm64 · bookworm

      Affected · Fixed: 1.6.18-1+deb12u1

      nvd · memcached · debian · bookworm; nvd · memcached · debian · 12

[Debian 13 (Trixie)]

  • [memcached]Affected
    Details (2)

    • 1.6.38-1 · amd64 · trixie

      Affected

      nvd · memcached · debian · 13

    • 1.6.38-1 · arm64 · trixie

      Affected

      nvd · memcached · debian · 13

[openSUSE Tumbleweed]

  • [memcached-devel]Unknown

    Source package: [memcached]

    Details (1)

    • 1.6.45-1.1 · x86_64 · tumbleweed

      Unknown · Fixed: 1.6.42-1.1

      Version impact unknown

      nvd · memcached · opensuse · tumbleweed

  • [memcached]Fixed

    Source package: [memcached]

    Details (1)

    • 1.6.45-1.1 · x86_64 · tumbleweed

      Fixed · Fixed: 1.6.42-1.1

      nvd · memcached · opensuse · tumbleweed

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]