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CVE-2026-64846— Nix: Arbitrary file truncation outside the sandbox with recursive-nix experimental feature

Quick assessment

Affected
NixOS nix
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.

Nix是Nix组织开源的一个可复现构建与包管理的系统工具。 Nix 2.35.0之前版本存在安全漏洞，该漏洞源于LocalStore恢复路径中最终符号链接处理的检查时间/使用时间竞争条件，可能导致Nix进程或nix-daemon在构建沙箱外以守护进程用户权限创建或截断空文件。

CVSS 2.8 · Low EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
NixOS nix < 2.35.0 affected
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I. Basic Information for CVE-2026-64846

Vulnerability Information
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Vulnerability Title
Nix: Arbitrary file truncation outside the sandbox with recursive-nix experimental feature
Source: CVE Program / CVE List V5
Vulnerability Description
Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Nix 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nix是Nix组织开源的一个可复现构建与包管理的系统工具。 Nix 2.35.0之前版本存在安全漏洞，该漏洞源于LocalStore恢复路径中最终符号链接处理的检查时间/使用时间竞争条件，可能导致Nix进程或nix-daemon在构建沙箱外以守护进程用户权限创建或截断空文件。
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
NixOS nix < 2.35.0 -

II. Public POCs for CVE-2026-64846

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III. Intelligence Information for CVE-2026-64846

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Patches & Fixes for CVE-2026-64846 (2)

Vendor Advisories for CVE-2026-64846 (1)

IV. Related Vulnerabilities

Same product: nix
Same vendor: NixOS
Same weakness: CWE-61

V. Comments for CVE-2026-64846

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