---
title: "CVE-2026-110449: Nix & Lix - Integer Overflow"
description: "Nix < 2.35.3 and Lix < 2.95.4 contain an integer overflow caused by mishandled list allocation when evaluating untrusted expressions, letting attackers cause out-of-bounds write, exploit requires untrusted expressions."
url: https://panop.io/threat-heartbeat/CVE-2026-110449/
---

# CVE-2026-110449 Nix & Lix - Integer Overflow

Nix < 2.35.3 and Lix < 2.95.4 contain an integer overflow caused by mishandled list allocation when evaluating untrusted expressions, letting attackers cause out-of-bounds write, exploit requires untrusted expressions.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.25% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-110449)

## Details

Type

Integer Overflow

Impact

Out Of Bounds Rw

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update Nix to 2.35.3 or later and Lix to 2.95.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-110449](https://nvd.nist.gov/vuln/detail/CVE-2026-110449)
- [https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547](https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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