CVE-2026-90698
Publication date 14 September 2026
Last updated 21 September 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| memcached | 26.04 LTS resolute |
Fixed 1.6.40-1ubuntu0.3
|
| 24.04 LTS noble |
Fixed 1.6.24-1ubuntu0.3
|
|
| 22.04 LTS jammy |
Fixed 1.6.14-1ubuntu0.3
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
CVSS version:
Base score
5.5 · Medium
Vector: 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
Base score
5.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
Related Ubuntu Security Notices (USN)
- USN-8792-1
- Memcached vulnerability
- 21 September 2026
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-90698
- https://github.com/memcached/memcached/
- https://github.com/memcached/memcached/releases/tag/1.6.44
- https://protectiv.ph/research/memcached-asciiauth-empty-line-dos
- https://vuldb.com/cve/CVE-2026-90698
- https://vuldb.com/submit/916217
- https://vuldb.com/submit/916219
- https://vuldb.com/vuln/403231
- https://vuldb.com/vuln/403231/cti