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

Quick assessment

Affected
Netatalk Netatalk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netatalk是Netatalk开源的一款软件，为 Classic Mac OS 和 macOS 在 Unix-like OS 上提供 AFP 文件服务器功能。 Netatalk 3.0.0版本至4.4.2版本存在安全漏洞，该漏洞源于ad_flush函数中存在检查时间使用时间条件，可能导致远程攻击者在特定竞争条件下造成有限的数据修改。

CVSS 3.7 · Low EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Netatalk Netatalk 3.0.0≤ 4.4.2 affected
4.5.0 unaffected
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I. Basic Information for CVE-2026-7837

Vulnerability Information
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Vulnerability Title
TOCTOU with root privilege in ad_flush
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Netatalk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netatalk是Netatalk开源的一款软件，为 Classic Mac OS 和 macOS 在 Unix-like OS 上提供 AFP 文件服务器功能。 Netatalk 3.0.0版本至4.4.2版本存在安全漏洞，该漏洞源于ad_flush函数中存在检查时间使用时间条件，可能导致远程攻击者在特定竞争条件下造成有限的数据修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netatalk Netatalk 3.0.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-7837

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III. Intelligence Information for CVE-2026-7837

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Vendor Advisories for CVE-2026-7837 (1)

Same Patch Batch · Netatalk · 2026-05-21 · 33 CVEs total

CVE-2026-44050 9.9 CRITICAL Heap buffer overflow in CNID daemon comm_rcv()
CVE-2026-44047 8.8 HIGH SQL injection in MySQL CNID backend
CVE-2026-44048 8.8 HIGH Stack buffer overflow via UCS-2 type confusion in convert_charset()
CVE-2026-44051 8.1 HIGH Arbitrary file read via attacker-controlled symlink creation
CVE-2026-44068 7.6 HIGH EA path traversal via incomplete sanitization
CVE-2026-44055 7.5 HIGH Bitwise OR logic bug enables shell injection
CVE-2026-44052 7.5 HIGH LDAP simple-bind password exposure in log output
CVE-2026-44060 7.5 HIGH Integer underflow in dsi_writeinit() leads to denial of service
CVE-2026-44049 7.5 HIGH Out-of-bounds write in convert_charset() null termination
CVE-2026-44062 7.5 HIGH Missing o_len bounds check in pull_charset_flags()
CVE-2026-44053 7.4 HIGH Weak cryptography in DHCAST128 UAM
CVE-2026-44066 7.1 HIGH Heap out-of-bounds reads in Spotlight RPC unmarshalling
CVE-2026-44064 7.1 HIGH ASP session ID out-of-bounds access
CVE-2026-44076 6.7 MEDIUM Shell injection via volume path
CVE-2026-44054 6.5 MEDIUM Predictable afpd session token
CVE-2026-44058 6.4 MEDIUM Authentication bypass via admin auth user
CVE-2026-44056 6.0 MEDIUM Stack buffer overflow in desktop.c
CVE-2026-44061 5.9 MEDIUM DES-ECB auth with timing side channel
CVE-2026-44063 4.2 MEDIUM LDAP filter injection
CVE-2026-44073 4.0 MEDIUM seteuid failure ignored in auth modules

Showing top 20 of 33 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Netatalk
Same vendor: Netatalk
Same weakness: CWE-367

V. Comments for CVE-2026-7837

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