CVE catalog
CVE-2026-47784
In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl_server_userdb_checkpass.
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.55% · Oct 25, 2026
In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl_server_userdb_checkpass.
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 | vulnerable |
| Debian | memcached | bookworm-security | 1.6.18-1+deb12u1 | fixed |
| Cpe | memcached | Not reported | 1.6.24-1ubuntu0.1 | fixed |
| Cpe | memcached | Not reported | Not reported | vulnerable |
| Cpe | memcached | Not reported | 1.6.42 | fixed |
| Ubuntu | memcached | pro | 1.4.33-1ubuntu3 | vulnerable |
| Ubuntu | memcached | pro | 1.5.4-1ubuntu2 | vulnerable |
| Ubuntu | memcached | pro | 1.5.4-1ubuntu3 | vulnerable |
| Ubuntu | memcached | pro | 1.5.6-0ubuntu1 | vulnerable |
| Ubuntu | memcached | pro | 1.5.6-0ubuntu1.1 | vulnerable |
| Ubuntu | memcached | pro | 1.5.6-0ubuntu1.2 | vulnerable |
| Ubuntu | memcached | pro | 1.5.6-0ubuntu1.2+esm1 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.10-0ubuntu3 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.10-0ubuntu4 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.19-2 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.20-1 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.22-1ubuntu1 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.22-2 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.22-2ubuntu0.1 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.22-2ubuntu0.2 | vulnerable |
| Ubuntu | memcached | 20.04 | 1.5.22-2ubuntu0.3 | vulnerable |
| 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 | 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 | fixed |
| Ubuntu | memcached | 25.10 | 1.6.37-1 | vulnerable |
| Ubuntu | memcached | 25.10 | 1.6.38-1 | vulnerable |
| Ubuntu | memcached | 25.10 | 1.6.38-1build1 | vulnerable |
| Ubuntu | memcached | 25.10 | 1.6.38-1ubuntu0.1 | 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 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | memcached | source | sid | 1.6.42-1 | not yet assigned | Not reported | [1137214] |
| Debian | memcached | source | forky | 1.6.42-1 | not yet assigned | Not reported | [1137214] |
| Debian | memcached | source | trixie | (unfixed) | not yet assigned | Not reported | [1137214] |
| Debian | memcached | source | bookworm | 1.6.18-1+deb12u1 | not yet assigned | Not reported | [1137214] |
| Cpe | memcached | cpe | Not reported | 1.6.24-1ubuntu0.1 | Not reported | Not reported | Not reported |
| Cpe | memcached | cpe | Not reported | 1.6.42 | Not reported | Not reported | Not reported |
| Ubuntu | memcached | deb | 22.04 | 1.6.14-1ubuntu0.2 | Not reported | UBUNTU-CVE-2026-47784 | Not reported |
| Ubuntu | memcached | deb | 24.04 | 1.6.24-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-47784 | Not reported |
| Ubuntu | memcached | deb | 25.10 | 1.6.38-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-47784 | Not reported |
| Ubuntu | memcached | deb | 26.04 | 1.6.40-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-47784 | Not reported |
Notes
[trixie] memcached: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [memcached]Affected
Details (2)
1.6.18-1· amd64 · bookwormAffected · Fixed:
1.6.18-1+deb12u1nvd · memcached · debian · bookworm; nvd · memcached · debian · 12
1.6.18-1· arm64 · bookwormAffected · Fixed:
1.6.18-1+deb12u1nvd · memcached · debian · bookworm; nvd · memcached · debian · 12
[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
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10882-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-47784]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-47784]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-47784]
- [https://security-tracker.debian.org/tracker/CVE-2026-47784]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47784.json]
- [https://ubuntu.com/security/notices/USN-8320-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1615.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]