Out-of-Bounds Read Vulnerability in Memcached by Memcached Inc.
CVE-2026-90698

6.9MEDIUM

Key Information:

Vendor

Memcached Inc.

Status
Memcached
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90698?

A security flaw has been identified in versions 1.6.41 through 1.6.43 of Memcached, specifically affecting the try_read_command_asciiauth function within the proto_text.c file of the mcmc Tokenizer component. This vulnerability enables a potential attacker to perform an out-of-bounds read, which could compromise the application when exploited remotely. The details of the vulnerability are publicly available, highlighting the urgency for users to upgrade to version 1.6.44, where this issue has been resolved. The responsible patch has been documented under identifier af05c9302bba508b736c3da1d5670f63fe8b7db4.

Affected Version(s)

memcached 1.6.41

memcached 1.6.42

memcached 1.6.43

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-90698 - Proof of Concept

References

https://vuldb.com/vuln/403231
vdb-entrytechnical-description
https://vuldb.com/vuln/403231/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90698
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ebfe7001d27b27064356271ddfb15d59 (VulDB User)
.