CVE-2026-7837 | TOCTOU with root privilege in ad_flush

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.

Published: 2026-05-21 Last update: 2026-05-21 Assigner: 33c584b5-0579-4c06-b2a0-8d8329fcab9c Source: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-7837 is rated Low Risk (18.5/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.04%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-7837

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-21 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-7837

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 1.4 33c584b5-0579-4c06-b2a0-8d8329fcab9c

Weakness enumeration for CVE-2026-7837

GitHub Security Advisory for CVE-2026-7837

GHSA-m59f-94xh-r8f7 · Severity: low — A time-of-check time-of-use (TOCTOU) condition in the ad_flush function in Netatalk 3.0.0 through...

OS Trackers for CVE-2026-7837

vendor priority summary link
debian unimportant CVE-2026-7837 unimportant priority: Debian including 1 source packages (netatalk), 4 status rows across 4 suites (bullseye, forky, sid, trixie): open 3, resolved 1. https://security-tracker.debian.org/tracker/CVE-2026-7837
suse low — https://www.suse.com/security/cve/CVE-2026-7837/
ubuntu medium CVE-2026-7837 medium priority: Ubuntu including 1 source packages (netatalk), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream): needs-triage 8. https://ubuntu.com/security/CVE-2026-7837

Affected software / configurations for CVE-2026-7837

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-7837

cvelogic Threat Intelligence