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Vulnerability · Published Sep 14, 2026 · Assigned by VulDB

CVE-2026-90698memcached mcmc Tokenizer proto_text.c try_read_command_asciiauth out-of-bounds

Medium 5.3

In plain English

A medium-severity out-of-bounds read in memcached. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.9%top 41.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13memcachedno fix listedDEBIAN-CVE-2026-90698
Debian:14memcached1.6.45-1DEBIAN-CVE-2026-90698
Ubuntu:22.04:LTSmemcached1.6.14-1ubuntu0.3UBUNTU-CVE-2026-90698
Ubuntu:22.04:LTSmemcached1.6.14-1ubuntu0.3USN-8792-1
Ubuntu:24.04:LTSmemcached1.6.24-1ubuntu0.3USN-8792-1
Ubuntu:24.04:LTSmemcached1.6.24-1ubuntu0.3UBUNTU-CVE-2026-90698
Ubuntu:26.04:LTSmemcached1.6.40-1ubuntu0.3USN-8792-1
Ubuntu:26.04:LTSmemcached1.6.40-1ubuntu0.3UBUNTU-CVE-2026-90698

Affected products (as reported)

VendorProductVersions
n/a memcached 1.6.411.6.421.6.43

Weakness: CWE-125, CWE-119 · Vector: 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

References