No exploitation reportedFix available

CVE-2026-47784

Q: Is CVE-2026-47784 actively exploited?

Active exploitation of CVE-2026-47784 has not been confirmed. Its EPSS score was 0.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-47784?

CVE-2026-47784 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2026-05-20
Fixed in1.6.42
WeaknessCWE-208

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2026-05-2007:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-47784?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-47784?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Memcached

Branch	Affected	Fixed in	Source
1.6	< 1.6.42	1.6.42	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-47784 Red Hat Product Security4 products fixed · 14 known affected
memcached: Memcached: Information disclosure via timing side channel
memcached as a component of Red Hat Enterprise Linux 10 · memcached-selinux as a component of Red Hat Enterprise Linux 10 · memcached.src as a component of Red Hat Enterprise Linux 10 · +11 more
RHSA-2026:23261 Red Hat Product Security7 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

Update Memcached to 1.6.42
Vendor fix Red Hat Product Security RHSA-2026:23261 · 7 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround from the vendor Red Hat Product Security RHSA-2026:23261 · 7 productsTo mitigate this issue, restrict network access to the memcached service to only trusted clients and networks using firewall rules. If SASL authentication is not strictly required, consider disabling it. If SASL is necessary, ensure that strong, unique passwords are used and rotated regularly. Exa…
No fix available, says the vendor Red Hat Product Security CVE-2026-47784 · 14 productsFix deferred

Advisories and patches

github.comPatch
github.comRelease Notes
github.comRelease Notes

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-05-20
OpenCVESSVC decisionnone—
CNACVSS 3.18.1read 2026-10-23
CNAweakness (CWE)CWE-208read 2026-10-23
FIRST EPSSEPSS score0.5 %2026-10-23
OSVaffected packages—
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-05-20
Last Modified: 2026-07-24
NVD status: Analyzed
MSRC Title: 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.

Frequently asked questions

What is 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.

Is CVE-2026-47784 actively exploited?

Active exploitation of CVE-2026-47784 has not been confirmed. Its EPSS score was 0.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-47784?

CVE-2026-47784 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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