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NVD / CVE Program· CNA mitre

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 a

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: memcached memcached 1.6.42; azl3 memcached 1.6.27-4 on Azure Linux 3.0 1.6.27-5.

Low priority for now. Upgrade to memcached memcached 1.6.42; azl3 memcached 1.6.27-4 on Azure Linux 3.0 1.6.27-5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
May 20, 2026
Updated
Sep 18, 2026
EPSS
1.2% · 69th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · mitre
8.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-47783

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
memcachedmemcached

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • memcached memcachedbefore 1.6.42

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.

  • memcached memcached

    • before 1.6.42affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10memcachedbefore 1.6.23-7.el10_2.11.6.23-7.el10_2.1
AlmaLinux:10memcached-selinuxbefore 1.6.23-7.el10_2.11.6.23-7.el10_2.1
AlmaLinux:9memcachedbefore 1.6.9-7.el9_8.11.6.9-7.el9_8.1
AlmaLinux:9memcached-selinuxbefore 1.6.9-7.el9_8.11.6.9-7.el9_8.1
Debian:12memcachedbefore 1.6.18-1+deb12u11.6.18-1+deb12u1
Debian:13memcachedfrom 0—
Debian:14memcachedbefore 1.6.42-11.6.42-1
openSUSE:Tumbleweedmemcachedbefore 1.6.42-1.11.6.42-1.1
Red Hat:enterprise_linux:10.2memcachedbefore 0:1.6.23-7.el10_2.10:1.6.23-7.el10_2.1
Red Hat:enterprise_linux:10.2memcached-debuginfobefore 0:1.6.23-7.el10_2.10:1.6.23-7.el10_2.1
Red Hat:enterprise_linux:10.2memcached-debugsourcebefore 0:1.6.23-7.el10_2.10:1.6.23-7.el10_2.1
Red Hat:enterprise_linux:10.2memcached-selinuxbefore 0:1.6.23-7.el10_2.10:1.6.23-7.el10_2.1
Red Hat:enterprise_linux:9::appstreammemcachedbefore 0:1.6.9-7.el9_8.10:1.6.9-7.el9_8.1
Red Hat:enterprise_linux:9::appstreammemcached-debuginfobefore 0:1.6.9-7.el9_8.10:1.6.9-7.el9_8.1
Red Hat:enterprise_linux:9::appstreammemcached-debugsourcebefore 0:1.6.9-7.el9_8.10:1.6.9-7.el9_8.1
Red Hat:enterprise_linux:9::appstreammemcached-selinuxbefore 0:1.6.9-7.el9_8.10:1.6.9-7.el9_8.1
Red Hat:hummingbird:1memcachedbefore 0:1.6.45-1.hum10:1.6.45-1.hum1
Red Hat:hummingbird:1memcached-develbefore 0:1.6.45-1.hum10:1.6.45-1.hum1
Red Hat:hummingbird:1memcached-selinuxbefore 0:1.6.45-1.hum10:1.6.45-1.hum1
Rocky Linux:10memcachedbefore 0:1.6.23-7.el10_2.10:1.6.23-7.el10_2.1
Rocky Linux:9memcachedbefore 0:1.6.9-7.el9_8.10:1.6.9-7.el9_8.1
SUSE:Linux Enterprise Server 16.0memcachedbefore 1.6.38-160000.3.11.6.38-160000.3.1

Same product

memcached: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-1000115Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP
    60This week
  • CVE-2016-8706An integer overflow in process_bin_sasl_auth function in Memcached, which is responsible for authentication commands of Memcached binary pro
    46Plan
  • CVE-2016-8704An integer overflow in the process_bin_append_prepend function in Memcached, which is responsible for processing multiple commands of Memcac
    46Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-46852Oct 27, 2023 · In Memcached before 1.6.22, a buffer overflow exists when processing multiget requests in proxy mode, if there are many spaces after the "ge
    30Monitor
  • ← EarlierCVE-2023-46853Oct 27, 2023 · In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used instead of \r\n.
    39Monitor
  • Later →CVE-2026-47784May 20, 2026 · In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
memcached memcached1.6.42Vendor (CNA)
azl3 memcached 1.6.27-4 on Azure Linux 3.01.6.27-5 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:memcached1.6.23-7.el10_2.1 · AlmaLinux:10Package registry (OSV)
almalinux:memcached-selinux1.6.23-7.el10_2.1 · AlmaLinux:10Package registry (OSV)
debian:memcached1.6.18-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:memcached1.6.42-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:memcached0:1.6.23-7.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:memcached-debuginfo0:1.6.23-7.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:memcached-debugsource0:1.6.23-7.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:memcached-devel0:1.6.45-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:memcached-selinux0:1.6.23-7.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:memcached0:1.6.23-7.el10_2.1 · Rocky Linux:10Package registry (OSV)
suse:memcached1.6.38-160000.3.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-477840 days apartIn memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl
    32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-208 · Observable Timing Discrepancy

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records