CVE catalog
CVE-2026-90698
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
- Severity
- Medium · CVSS 5.5
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.86% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | memcached | sid | 1.6.45-1 | fixed |
| Debian | memcached | forky | 1.6.45-1 | fixed |
| Debian | memcached | trixie | 1.6.38-1 | vulnerable |
| Debian | memcached | bookworm | 1.6.18-1 | not affected |
| Debian | memcached | bookworm-security | 1.6.18-1+deb12u1 | not affected |
| Ubuntu | memcached | noble | 1.6.24-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 22.04 | 1.6.9+dfsg-1build1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-3 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-4 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.13-1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 24.04 | 1.6.21-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.22-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.23-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1build1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1build3 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 26.04 | 1.6.38-1build1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.39-2 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 22.04 | 1.6.9+dfsg-1build1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-3 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.12+dfsg-4 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.13-1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 22.04 | 1.6.14-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 24.04 | 1.6.21-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.22-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.23-1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1build1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1build3 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 24.04 | 1.6.24-1ubuntu0.3 | fixed |
| Ubuntu | memcached | 26.04 | 1.6.38-1build1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.39-2 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 26.04 | 1.6.40-1ubuntu0.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | memcached | source | sid | 1.6.45-1 | not yet assigned | Not reported | Not reported |
| Debian | memcached | source | forky | 1.6.45-1 | not yet assigned | Not reported | Not reported |
| Debian | memcached | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | memcached | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Ubuntu | memcached | deb | noble | 1.6.24-1ubuntu0.3 | Not reported | Not reported | Not reported |
| Ubuntu | memcached | deb | 22.04 | 1.6.14-1ubuntu0.3 | Not reported | UBUNTU-CVE-2026-90698 | Not reported |
| Ubuntu | memcached | deb | 24.04 | 1.6.24-1ubuntu0.3 | Not reported | UBUNTU-CVE-2026-90698 | Not reported |
| Ubuntu | memcached | deb | 26.04 | 1.6.40-1ubuntu0.3 | Not reported | UBUNTU-CVE-2026-90698 | Not reported |
| Ubuntu | memcached | deb | 22.04 | 1.6.14-1ubuntu0.3 | Not reported | USN-8792-1 | Not reported |
| Ubuntu | memcached | deb | 24.04 | 1.6.24-1ubuntu0.3 | Not reported | USN-8792-1 | Not reported |
| Ubuntu | memcached | deb | 26.04 | 1.6.40-1ubuntu0.3 | Not reported | USN-8792-1 | Not reported |
Notes
[trixie] memcached: Minor issue
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [memcached]Affected
Details (2)
1.6.38-1· amd64 · trixieAffected
nvd · memcached · debian · 13
1.6.38-1· arm64 · trixieAffected
nvd · memcached · debian · 13
[Debian 12 (Bookworm)]
- [memcached]Not affected
Details (2)
1.6.18-1· amd64 · bookwormNot affected
nvd · memcached · debian · bookworm
1.6.18-1· arm64 · bookwormNot affected
nvd · memcached · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-90698]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-90698]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-90698]
- [https://osv.dev/vulnerability/USN-8792-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-90698]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90698.json]
- [https://ubuntu.com/security/notices/USN-8792-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3336.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]