CVE-2026-47784
In memcached before 1.6.42, password data for SASL password database authentication has a timing...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-47784- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-208
- Updated
- 2026-11-02
EUVDEUVD-2026-31069
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.
- Record
EUVD-2026-31069- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-r4h3-4q3v-2776
In memcached before 1.6.42, password data for SASL password database authentication has a timing...
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.
- Record
GHSA-r4h3-4q3v-2776- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-208
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-47784- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-208
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2026-47784- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-208
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-47784
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.
- Record
DEBIAN-CVE-2026-47784- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 11 moreShow less
OSVOESA-2026-2539
memcached security update
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):
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)
- Record
OESA-2026-2539- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVRHSA-2026:23261
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:23261- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-47784
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.
- Record
UBUNTU-CVE-2026-47784- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVAZL-87005 No score
CVE-2026-47784 affecting package memcached for versions less than 1.6.27-5
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.
- Record
AZL-87005- Updated
- 2026-11-05
OSVBIT-memcached-2026-47784 No score
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.
- Record
BIT-memcached-2026-47784- Updated
- 2026-11-02
OSVMGASA-2026-0203 No score
Updated memcached packages fix security vulnerabilities
CVE-2026-47784 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-2026-47783 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.
- Record
MGASA-2026-0203- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:10882-1 No score
memcached-1.6.42-1.1 on GA media
These are all security issues fixed in the memcached-1.6.42-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:10882-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:20884-1 No score
Security update for memcached
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).
- Record
openSUSE-SU-2026:20884-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:22022-1 No score
Security update for memcached
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).
- Record
SUSE-SU-2026:22022-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:2292-1 No score
Security update for memcached
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).
- Record
SUSE-SU-2026:2292-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:2293-1 No score
Security update for memcached
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).
- Record
SUSE-SU-2026:2293-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
memcachedAzure Linux:3 |
before 1.6.27-5 | 1.6.27-5 |
memcachedBitnami |
before 1.6.42 | 1.6.42 |
memcachedDebian:12 |
before 1.6.18-1+deb12u1, plus listed versions 1.6.18-1 |
1.6.18-1+deb12u1 |
memcachedDebian:13 |
All versions, plus listed versions 1.6.38-11.6.39-11.6.39-21.6.40-11.6.41-11.6.41-21.6.42-11.6.45-1 |
None known |
memcachedDebian:14 |
before 1.6.42-1, plus listed versions 1.6.38-11.6.39-11.6.39-21.6.40-11.6.41-11.6.41-2 |
1.6.42-1 |
memcachedMageia:9 From an advisory covering 2 CVEs |
before 1.6.42-1.mga9 | 1.6.42-1.mga9 |
memcachedopenEuler:24.03-LTS-SP1 From an advisory covering 2 CVEs |
before 1.6.22-5.oe2403sp1 | 1.6.22-5.oe2403sp1 |
memcachedopenEuler:24.03-LTS-SP3 From an advisory covering 2 CVEs |
before 1.6.22-5.oe2403sp3 | 1.6.22-5.oe2403sp3 |
memcachedopenEuler:20.03-LTS-SP4 From an advisory covering 2 CVEs |
before 1.5.10-7.oe2003sp4 | 1.5.10-7.oe2003sp4 |
memcachedopenEuler:22.03-LTS-SP4 From an advisory covering 2 CVEs |
before 1.6.12-5.oe2203sp4 | 1.6.12-5.oe2203sp4 |
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| Package | Affected | Fixed |
|---|---|---|
memcachedopenEuler:24.03-LTS From an advisory covering 2 CVEs |
before 1.6.22-5.oe2403 | 1.6.22-5.oe2403 |
memcachedRed Hat:hummingbird:1 |
before 0:1.6.42-0.1.hum1 | 0:1.6.42-0.1.hum1 |
memcached-develRed Hat:hummingbird:1 |
before 0:1.6.42-0.1.hum1 | 0:1.6.42-0.1.hum1 |
memcached-selinuxRed Hat:hummingbird:1 |
before 0:1.6.42-0.1.hum1 | 0:1.6.42-0.1.hum1 |
memcachedSUSE:Linux Enterprise Server 16.0 From an advisory covering 2 CVEs |
before 1.6.38-160000.3.1 | 1.6.38-160000.3.1 |
memcachedSUSE:Linux Enterprise Server for SAP applications 16.0 From an advisory covering 2 CVEs |
before 1.6.38-160000.3.1 | 1.6.38-160000.3.1 |
memcachedUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.4.24-2ubuntu11.4.25-1ubuntu21.4.25-2ubuntu11.4.25-2ubuntu1.21.4.25-2ubuntu1.31.4.25-2ubuntu1.41.4.25-2ubuntu1.51.4.25-2ubuntu1.5+esm1 |
None known |
memcachedUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 1.4.33-1ubuntu31.5.4-1ubuntu21.5.4-1ubuntu31.5.6-0ubuntu11.5.6-0ubuntu1.11.5.6-0ubuntu1.21.5.6-0ubuntu1.2+esm1 |
None known |
memcachedUbuntu:20.04:LTS |
All versions, plus listed versions 1.5.10-0ubuntu31.5.10-0ubuntu41.5.19-21.5.20-11.5.22-1ubuntu1 Show 4 moreShow less1.5.22-21.5.22-2ubuntu0.11.5.22-2ubuntu0.21.5.22-2ubuntu0.3 |
None known |
memcachedUbuntu:22.04:LTS |
before 1.6.14-1ubuntu0.2, plus listed versions 1.6.9+dfsg-1build11.6.12+dfsg-2ubuntu11.6.12+dfsg-31.6.12+dfsg-41.6.13-11.6.14-11.6.14-1ubuntu0.1 |
1.6.14-1ubuntu0.2 |
memcachedUbuntu:24.04:LTS |
before 1.6.24-1ubuntu0.1, plus listed versions 1.6.21-11.6.22-11.6.23-11.6.24-1build11.6.24-1build3 |
1.6.24-1ubuntu0.1 |
memcachedUbuntu:25.10 |
before 1.6.38-1ubuntu0.1, plus listed versions 1.6.37-11.6.38-11.6.38-1build1 |
1.6.38-1ubuntu0.1 |
memcachedUbuntu:26.04:LTS |
before 1.6.40-1ubuntu0.1, plus listed versions 1.6.38-1build11.6.39-21.6.40-1 |
1.6.40-1ubuntu0.1 |
memcachedopenSUSE:Tumbleweed From an advisory covering 2 CVEs |
before 1.6.42-1.1 | 1.6.42-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| facts | OSV | |
| affected, aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-47784 is a high vulnerability (CVSS 8.1) in Memcached, published May 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in memcached 1.6.27-5.
References
github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed
nvd.nist.gov/vuln/detail/CVE-2026-47784
Show 21 moreShow less
security-tracker.debian.org/tracker/CVE-2026-47784
advisories.mageia.org/MGASA-2026-0203.html
bugs.mageia.org/show_bug.cgi?id=35552
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-2539
access.redhat.com/errata/RHSA-2026:23261
images.redhat.com
security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_23261.json
bugzilla.redhat.com/show_bug.cgi?id=2480088
cve.org/CVERecord?id=CVE-2026-47784
suse.com/support/update/announcement/2026/suse-su-202622022-1
bugzilla.suse.com/1265873
ubuntu.com/security/CVE-2026-47784