CVE-2026-44028: High severity Nix Nix vulnerability
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).
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-44028?
CVE-2026-44028 is considered a critical vulnerability due to its potential to cause stack-to-heap overflow, leading to local privilege escalation.
How do I fix CVE-2026-44028?
To remediate CVE-2026-44028, users should update Nix to version 2.34.8 or later and Lix to version 2.95.3 or later.
What products are affected by CVE-2026-44028?
CVE-2026-44028 affects Nix versions prior to 2.34.7 and Lix versions prior to 2.95.2.
What is the impact of CVE-2026-44028?
CVE-2026-44028 can lead to local privilege escalation, allowing attackers to gain elevated access on affected systems.
How can I check if my software is vulnerable to CVE-2026-44028?
You can check your software versions against the affected versions of Nix and Lix to determine vulnerability to CVE-2026-44028.