CVE-2026-7837 TOCTOU with root privilege in ad_flush
A remote attacker can exploit a race condition in Netatalk to modify limited data via root-privileged file operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-7837?
CVE-2026-7837 is a low-severity vulnerability in Netatalk, published on 21 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-367
Which versions are affected by CVE-2026-7837?
How do I fix CVE-2026-7837?
Upgrade to a fixed version.
Is CVE-2026-7837 being exploited?
There is no known exploitation of CVE-2026-7837 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-7837, GHSA-m59f-94xh-r8f7, UBUNTU-CVE-2026-7837.