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Details of issue NIXPKGS-2026-2232

NIXPKGS-2026-2232
published 6 hours ago
WCOW cache mount source selector resolves NTFS junctions outside of cache root
Permalink CVE-2026-15788
5.6 MEDIUM
  • CVSS version (CVSS): 4.0
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Attack Requirement (AT): Present (P)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): Active (A)
  • Vulnerable System Impact Confidentiality (VC): High (H)
  • Vulnerable System Impact Integrity (VI): None (N)
  • Vulnerable System Impact Availability (VA): None (N)
  • Subsequent System Impact Confidentiality (SC): None (N)
  • Subsequent System Impact Integrity (SI): None (N)
  • Subsequent System Impact Availability (SA): None (N)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Attack Requirement (MAT): Present (P)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): Active (A)
  • Modified Vulnerable System Impact Confidentiality (MVC): High (H)
  • Modified Vulnerable System Impact Integrity (MVI): None (N)
  • Modified Vulnerable System Impact Availability (MVA): None (N)
  • Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
  • Modified Subsequent System Impact Integrity (MSI): Negligible (N)
  • Modified Subsequent System Impact Availability (MSA): Negligible (N)
  • Safety (S): Not Defined (X)
  • Automatable (AU): Not Defined (X)
  • Recovery (R): Not Defined (X)
  • Value Density (V): Not Defined (X)
  • Vulnerability Response Effort (RE): Not Defined (X)
  • Provider Urgency (U): Not Defined (X)
  • Confidentiality Req. (CR): Not Defined (X)
  • Integrity Req. (IR): Not Defined (X)
  • Availability Req. (AR): Not Defined (X)
  • Exploit Maturity (E): Not Defined (X)
updated 6 hours ago by @LeSuisse Activity log
  • Created suggestion 8 hours ago
  • @LeSuisse ignored
    9 packages
    • buildkit-nix
    • buildkite-cli
    • buildkite-agent
    • buildkite-agent-metrics
    • buildkite-test-collector-rust
    • python313Packages.pybuildkite
    • python314Packages.pybuildkite
    • terraform-providers.buildkite
    • terraform-providers.buildkite_buildkite
    8 hours ago
  • @LeSuisse accepted 8 hours ago
  • @LeSuisse published on GitHub 6 hours ago
WCOW cache mount source selector resolves NTFS junctions outside of cache root

BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.

Affected products

BuildKit
  • <0.31.2

Matching in nixpkgs

pkgs.buildkit

Concurrent, cache-efficient, and Dockerfile-agnostic builder toolkit

Ignored packages (9)

Package maintainers

Needs a port to stable