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TI-2026-73873 Aliases CVE-2026-110453GHSA-cm63-px87-wf8p

Incorrect authorization in Nix lets build users reach daemon clients

Priority LOW 19CWE-863Published · Updated

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 2.28.8, from 2.29.0 before 2.30.6, from 2.31.0 before 2.31.6, from 2.32.0 before 2.34.9 and from 2.35.0 before 2.35.3 are affected on macOS or FreeBSD when unsandboxed. An incorrect authorization check (CWE-863) lets connections made by build users from daemon clients pass when they should be refused. An unprivileged local attacker can affect integrity in other components without user interaction.

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

Description from the CNA

Nix before 2.35.3, when unsandboxed on macOS or FreeBSD, incorrectly allows connections made by build users from daemon clients.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00132 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

VendorProductAffected versionsFixed inStatusSource
NixOSNixbefore 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 2.35.32.28.8, 2.30.6, 2.31.6, 2.34.9, 2.35.3Patch availableCNA
  • 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.

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

Remediation

Upgrade to Nix 2.28.8, 2.30.6, 2.31.6, 2.34.9 or 2.35.3, using the fixed version for the release branch in use.

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 ·

    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-2026-73871 Seatbelt sandbox escape in Nix and Lix builds on macOSPriority LOW 19
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-110453
  2. 2026-10-14 Alias added: GHSA-cm63-px87-wf8p
  3. 2026-10-15 Affected versions changed · Red Hat
  4. 2026-10-15 CVSS score added · Red Hat
  5. 2026-10-20 CISA SSVC decision points changed

References

Other 1

  • 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