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Details of issue NIXPKGS-2026-2127

NIXPKGS-2026-2127
published 2 hours ago
Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination
Permalink CVE-2026-58494
6.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Changed (C)
  • Confidentiality (C): None (N)
  • Integrity (I): High (H)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): None (N)
updated 2 hours ago by @LeSuisse Activity log
  • Created suggestion 8 hours ago
  • @LeSuisse ignored
    2 packages
    • python313Packages.wasmtime
    • python314Packages.wasmtime
    3 hours ago
  • @LeSuisse accepted 3 hours ago
  • @LeSuisse published on GitHub 2 hours ago
Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1.

Affected products

wasmtime
  • ==>= 25.0.0, < 36.0.12
  • ==>= 46.0.0, < 46.0.1
  • ==>= 37.0.0, < 45.0.3
  • ==< 24.0.11

Matching in nixpkgs

pkgs.wasmtime

Standalone JIT-style runtime for WebAssembly, using Cranelift

Ignored packages (2)

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