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CVE-2026-47783

Quick assessment

Affected
memcached memcached
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Memcached是美国memcached community社区的一套高性能的分布式内存对象缓存系统。 Memcached 1.6.42之前版本存在安全漏洞，该漏洞源于SASL密码数据库认证中用户名数据存在时序侧信道，因为sasl_server_userdb_checkpass在找到有效用户名后立即退出循环。

CVSS 8.1 · High EPSS 1.26% · P69

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories

Affected Version Matrix 1

VendorProduct Version RangeStatus
memcached memcached < 1.6.42 affected
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I. Basic Information for CVE-2026-47783

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Memcached 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Memcached是美国memcached community社区的一套高性能的分布式内存对象缓存系统。 Memcached 1.6.42之前版本存在安全漏洞，该漏洞源于SASL密码数据库认证中用户名数据存在时序侧信道，因为sasl_server_userdb_checkpass在找到有效用户名后立即退出循环。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
memcached memcached 0 ~ 1.6.42 -

II. Public POCs for CVE-2026-47783

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11469 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-47783

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Patches & Fixes for CVE-2026-47783 (2)

Vendor Pages for CVE-2026-47783 (1)

IV. Related Vulnerabilities

Same product: memcached
Same vendor: memcached
Same weakness: CWE-208

V. Comments for CVE-2026-47783

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