8.1

CVE-2026-47784: memcached Observable Timing Discrepancy

Analyzed
AliasesRHSA-2026:23261UBUNTU-CVE-2026-47784DEBIAN-CVE-2026-47784
Published 20-05-2026Last modified 20-05-2026

Vulnerability summary

CVE-2026-47784 is a high (CVSS 8.1) Observable Timing Discrepancy vulnerability in memcached. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 46% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
MGASA-2026-0203OPENSUSE-SU-2026:10882-1SUSE-SU-2026:22022-1USN-8320-1

Timeline

  1. 20-05-2026
    PublishedVulnerability first disclosed.
  2. 20-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.55% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat3 products
  • memcached< 0:1.6.42-0.1.hum1
  • memcached-devel< 0:1.6.42-0.1.hum1
  • memcached-selinux< 0:1.6.42-0.1.hum1
Debian1 product
  • memcached< 1.6.18-1+deb12u1 | All versions (No fix recorded) | < 1.6.42-1
Memcached1 product
Ubuntu1 product
  • memcachedAll versions (No fix recorded) | < 1.6.14-1ubuntu0.2 | < 1.6.24-1ubuntu0.1 | < 1.6.38-1ubuntu0.1 | < 1.6.40-1ubuntu0.1

4 vendors · 6 products

References

14 links
Show all 14 references