Lix

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).

Published: 2026-05-05T00:30:16.205Z
Updated: 2026-05-09T03:40:06.637Z

lix through 15.8.7 allows man-in-the-middle attackers to execute arbitrary code by modifying the HTTP client-server data stream so that the Location header is associated with attacker-controlled executable content in the postDownload field.

Published: 2020-03-21T14:06:56.000Z
Updated: 2024-08-04T11:14:15.583Z