CVE-2026-47783: memcached Observable Timing Discrepancy
Vulnerability summary
CVE-2026-47783 is a high (CVSS 8.1) Observable Timing Discrepancy vulnerability in memcached. EPSS estimates a 1.26% chance of exploitation in the next 30 days, higher than 69.7% of scored vulnerabilities.
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?Advisory lineage
Upstream 0 · Downstream 4 · Related 3Timeline
- 20-05-2026PublishedVulnerability first disclosed.
- 18-09-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · Red hatEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.26%
Chance of exploitation in the next 30 days
Percentile
70%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.26% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat4 products
- memcached< 0:1.6.23-7.el10_2.1 | < 0:1.6.9-7.el9_8.1
- memcached-debuginfo< 0:1.6.23-7.el10_2.1 | < 0:1.6.9-7.el9_8.1
- memcached-debugsource< 0:1.6.23-7.el10_2.1 | < 0:1.6.9-7.el9_8.1
- memcached-selinux< 0:1.6.23-7.el10_2.1 | < 0:1.6.9-7.el9_8.1
Debian1 product
- memcached< 1.6.18-1+deb12u1 | All versions (No fix recorded) | < 1.6.42-1
Memcached1 product
- memcached< 1.6.42
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 · 7 products
