---
id: CVE-2026-90698
title: A security flaw has been discovered in memcached 1.6.41/1.6.42/1.6.43
summary: >-
  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…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-119
  - CWE-125
vendor: Red Hat
product: memcached
affected:
  - memcached 1.6.41
  - memcached 1.6.42
  - memcached 1.6.43
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T16:17:40.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90698'
references:
  - url: 'https://github.com/memcached/memcached/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/memcached/memcached/commit/af05c9302bba508b736c3da1d5670f63fe8b7db4
    label: cna@vuldb.com
  - url: 'https://github.com/memcached/memcached/releases/tag/1.6.44'
    label: cna@vuldb.com
  - url: 'https://protectiv.ph/research/memcached-asciiauth-empty-line-dos'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-90698'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/916217'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/916219'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403231'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403231/cti'
    label: cna@vuldb.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90698.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90698'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532955'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90698'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90698'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63224'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T15:55:23.607079Z'
epss: 0.00859
epssPercentile: 0.56666
ingestedAt: '2026-09-14T15:23:07.464Z'
patched:
  - hardened_images
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90698.json)
- **RHSA-2026:63224** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63224)