CVE-2026-44028
Description
An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine stack. The stack is allocated without a guard page, which means that a stack overflow could overwrite memory on the heap and could allow arbitrary code execution as the Nix daemon (run as root in multi-user installations) if ASLR hardening is bypassed. This can be exploited by all users able to connect to the daemon (e.g., in Nix, this is configurable via the allowed-users setting, defaulting to all users). The fixed versions are 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, and 2.28.7 for Nix (introduced in 2.24.4); and 2.95.2, 2.94.2, and 2.93.4 for Lix (introduced in 2.93.0).
How to fix
- NixOS Nix2.28.7, 2.29.4, 2.30.5, 2.31.5, 2.32.8, 2.33.6, 2.34.7 or later
- Lix Project Lix2.93.4, 2.94.2, 2.95.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| NixOS Nix | 2.24.4 ≤ v < 2.28.7, 2.29.0 ≤ v < 2.29.4, 2.30.0 ≤ v < 2.30.5, 2.31.0 ≤ v < 2.31.5, 2.32.0 ≤ v < 2.32.8, 2.33.0 ≤ v < 2.33.6, 2.34.0 ≤ v < 2.34.7 | 2.28.7, 2.29.4, 2.30.5, 2.31.5, 2.32.8, 2.33.6, 2.34.7 |
| Lix Project Lix | 2.93.0 ≤ v < 2.93.4, 2.94.0 ≤ v < 2.94.2, 2.95.0 ≤ v < 2.95.2 | 2.93.4, 2.94.2, 2.95.2 |
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