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Fencer Vulns
high 8.1

CVE-2026-47784 json

In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sas…

published 2026-05-20 5 mo ago modified 2026-09-08 2 mo ago also BIT-memcached-2026-47784 , EUVD-2026-31069

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami memcached 1.6.42
  • memcached memcached 1.6.42
  • memcached Debian 12 1.6.18-1+deb12u1
  • memcached Debian 14 1.6.42-1

debian advisories DEBIAN-CVE-2026-47784

  • memcached Ubuntu 22.04 LTS 1.6.14-1ubuntu0.2
  • memcached Ubuntu 24.04 LTS 1.6.24-1ubuntu0.1
  • memcached Ubuntu 25.10 1.6.38-1ubuntu0.1
  • memcached Ubuntu 26.04 LTS 1.6.40-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-47784

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • memcached hummingbird 1 1.6.42-0.1.hum1
  • memcached-selinux hummingbird 1 1.6.42-0.1.hum1

red hat advisories RHSA-2026:23261

  • memcached SLES for SAP applications 16.0, SLES 16.0 1.6.38-160000.3.1

suse advisories SUSE-SU-2026:22022-1

  • memcached openSUSE Tumbleweed 1.6.42-1.1

opensuse advisories openSUSE-SU-2026:10882-1

  • memcached Azure Linux 3.0 1.6.27-5

azure linux advisories AZL-87005

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-47784 updated cvss 5.9

memcached: Memcached: Information disclosure via timing side channel

  • Red Hat Enterprise Linux 6 memcached Red Hat Enterprise Linux 7 memcached Red Hat Enterprise Linux 8 memcached Red Hat Enterprise Linux 9 memcached, memcached-selinux Red Hat Enterprise Linux 10 memcached
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images memcached 1.6.42-0.1.hum1, memcached-selinux 1.6.42-0.1.hum1
    fixed: vendor fix RHSA-2026:23261

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami memcached
<1.6.42
1.6.42

Affected products

  • memcached memcached

Classification

Weakness
  • CWE-208 Observable Timing Discrepancy

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.