TI-2026-73871 Aliases CVE-2026-110451 GHSA-5h53-jg3j-22gg

Seatbelt sandbox escape in Nix and Lix builds on macOS

LOW 19CWE-863Published 2026-10-14 · Updated 2026-10-14

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Nix before 2.35.3 and Lix before 2.95.4 on macOS allow a Seatbelt sandbox escape for unconfined builds because a certain size threshold is mishandled (CWE-863). A local attacker with no privileges can trigger the escape without user interaction, which can affect integrity.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Nix before 2.35.3 and Lix before 2.95.4 on macOS allow a Seatbelt sandbox escape (for an unconfined build) because a certain size threshold is mishandled.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00131 2nd percentileScored 2026-11-07

Fix Fixed Nix (NixOS): 2.28.8, 2.30.6, 2.31.6 +2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
NixOS	Nix	before 2.28.8; 2.29.0 to before 2.30.6; 2.31.0 to before 2.31.6; 2.32.0 to before 2.34.9; 2.35.0 to before 2.35.3	2.28.8, 2.30.6, 2.31.6, 2.34.9, 2.35.3	Patch available	CNA

Nix VendorNixOS Affected before 2.28.8; 2.29.0 to before 2.30.6; 2.31.0 to before 2.31.6; 2.32.0 to before 2.34.9; 2.35.0 to before 2.35.3 Fixed in 2.28.8, 2.30.6, 2.31.6, 2.34.9, 2.35.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:nixos:nix::::::::	—	—	NixOS

cpe:2.3:a:nixos:nix:*:*:*:*:*:*:*:* Versions — — ·NixOS

Remediation

Upgrade Nix to 2.28.8, 2.30.6, 2.31.6, 2.34.9 or 2.35.3, and upgrade Lix to 2.95.4.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA Nix (NixOS) Fixed in 2.28.8, 2.30.6, 2.31.6, 2.34.9, 2.35.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-14
NixOS Nix 2.28.8, 2.30.6 and 3 more versions
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2026-73870 Nix and Lix repair operation lets local users escalate privilegesPriority LOW 36
- TI-2026-73869 Integer overflow in Nix and Lix list allocation enables out-of-bounds writePriority LOW 32
- TI-2026-73873 Incorrect authorization in Nix lets build users reach daemon clientsPriority LOW 19
Show all 5 records →

Timeline

2026-10-14 Threatist record created from CVE-2026-110451
2026-10-14 Alias added: GHSA-5h53-jg3j-22gg
2026-10-14 CISA SSVC decision points changed

References

Other 1

https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547

TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
TI-2024-11208 Rsync: heap buffer overflow in rsync due to improper checksum length handling CVSS 3.1CRITICAL 9.8
TI-2026-19201 Tandoor Recipes module allows SQLite database to be externally accessible with the default settings CVSS 4.0HIGH 8.7
TI-2024-11209 Rsync: info leak via uninitialized stack contents CVSS 3.1HIGH 7.5
TI-2024-11212 Rsync: --safe-links option bypass leads to path traversal CVSS 3.1HIGH 7.5
TI-2024-11211 Rsync: path traversal vulnerability in rsync CVSS 3.1HIGH 7.5

See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences