CVE-2026-90698

memcached mcmc Tokenizer proto_text.c try_read_command_asciiauth out-of-bounds

State: Published
Severity: 6.9 Medium
Published: Sep 14, 2026
Updated: Sep 15, 2026
Reserved: Sep 13, 2026

Description

A security flaw has been discovered in memcached 1.6.41/1.6.42/1.6.43. This vulnerability affects the function try_read_command_asciiauth of the file proto_text.c of the component mcmc Tokenizer. The manipulation results in out-of-bounds read. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.44 is able to resolve this issue. The patch is identified as af05c9302bba508b736c3da1d5670f63fe8b7db4. You should upgrade the affected component.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
3.0	5.3 Medium	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
2.0	5.0 Medium	AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-125 Out-of-Bounds Read
CWE-119 Memory Corruption

Affected Products

Product	Versions
memcachedn/a	1.6.41Affected 1.6.42Affected 1.6.43Affected 1.6.44Not affected

References

VDB-403231 | memcached mcmc Tokenizer proto_text.c try_read_command_asciiauth out-of-boundsvdb-entrytechnical-description
VDB-403231 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-90698 | CVE Analysis and Reportthird-party-advisory
Submit #916217 | Memcached 1.6.41 through 1.6.43 Out-of-Bounds Readthird-party-advisory
Submit #916219 | Memcached 1.6.41 > 1.6.43 Out-of-Bounds Read (Duplicate)third-party-advisory
https://protectiv.ph/research/memcached-asciiauth-empty-line-dosexploit
https://github.com/memcached/memcached/commit/af05c9302bba508b736c3da1d5670f63fe8b7db4patch
https://github.com/memcached/memcached/releases/tag/1.6.44patch
https://github.com/memcached/memcached/product

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