Integer overflow in nix - CVE-2026-110449
Published: October 15, 2026
Vulnerability identifier: #VU155872
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-110449
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt heap memory.
The vulnerability exists due to unsigned integer overflow in the list size calculation of libexpr's builtins.genList when evaluating expressions with large list-size arguments. A remote attacker can supply large arguments that cause a mismatch between the allocated list size and the expected list size to corrupt heap memory.
The possibility of out-of-bounds writes depends on the Nix version and compiler optimizations. Out-of-bounds reads can be triggered reliably.
Affected software
nix
How to mitigate CVE-2026-110449
Install security update from vendor's website.
nix - addressed in versions 2.28.8, 2.30.6, 2.31.6, 2.34.9, 2.35.3