{"id":"CVE-2026-100368","aliases":["GHSA-wrvw-254r-wpmv"],"url":"https://o3.security/vulnerability/CVE-2026-100368","summary":"CliInvoke.Specializations: Command injection in PowerShell and Cmd shell wrappers","details":"### Impact\nAn OS command injection vulnerability exists in the PowerShell and Cmd shell wrappers provided by the `CliInvoke.Specializations` package (the `PowershellProcessInvoker`/`CmdProcessInvoker` invokers, and the `UsePowerShell`/`UseCmd` middleware in v3 pre-release versions).\n\nThe wrappers re-run a caller-supplied target and arguments inside a shell command (`pwsh -Command ...` / `cmd /c ...`). In affected versions the wrapped command was delivered to the operating system as a single `ProcessStartInfo.Arguments` string. The OS command-line parser re-tokenizes that string before the shell parses it, so a double quote (`\"`) in the target or arguments breaks OS-level quoting and lets the wrapped shell reassemble a second, unintended command. \n\nAn attacker could exploit this to execute arbitrary commands with the privileges of the host process.\n\n### Patches\nThe Specializations Packages now deliver the command via `ProcessStartInfo.ArgumentList` (natively where supported, and polyfilled in older TFMs), so that the operating system passes argv verbatim and only the shell parses the command once. \n\nUpgrade to:\n- **2.8.5** (2.8.x line)\n- **2.9.4** (2.9.x line)\n- **2.10.5** (2.10.x line)\n- **3.0.0-beta.1** (3.x pre-release line)\n\n### Workarounds\nNo complete workaround is available. Until upgraded:\n\n- Reject or strip `\"` from any target path or argument passed to the PowerShell/Cmd wrappers. On 2.2.0 – 2.9.2 and 3.0.0-alpha.1 – alpha.4, also reject shell metacharacters (`;`, `|`, `&`, `$`, backtick, parentheses).\n- Alternatively, bypass the wrappers for untrusted input and invoke the target process directly so that no second shell parse of the data occurs.","published":"2026-09-25T19:53:56.299Z","modified":"2026-10-21T02:54:29.634825323Z","cvss":{"score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"NuGet","name":"CliInvoke.Specializations","fixedVersion":"2.8.5"},{"ecosystem":"NuGet","name":"CliInvoke.Specializations","fixedVersion":"2.9.4"},{"ecosystem":"NuGet","name":"CliInvoke.Specializations","fixedVersion":"2.10.5"},{"ecosystem":"NuGet","name":"CliInvoke.Specializations","fixedVersion":"3.0.0-beta.1"},{"ecosystem":"NuGet","name":"CliInvoke.Specializations","fixedVersion":"3.0.0-beta.1"},{"ecosystem":"NuGet","name":"AlastairLundy.CliInvoke.Specializations","fixedVersion":"2.0.2"}],"fix":{"url":"https://github.com/alastairlundy/CliInvoke/commit/1e98582f02eb43e345e5b97b8dd6ff9443806685","label":"alastairlundy/CliInvoke@1e98582"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100368.json"},{"type":"ADVISORY","url":"https://github.com/alastairlundy/CliInvoke/security/advisories/GHSA-wrvw-254r-wpmv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100368"},{"type":"WEB","url":"https://github.com/alastairlundy/CliInvoke/commit/1e98582f02eb43e345e5b97b8dd6ff9443806685"},{"type":"WEB","url":"https://github.com/alastairlundy/CliInvoke/commit/2077e5239850e83dc9cc67ae6036dcd4e68a1876"},{"type":"PACKAGE","url":"https://github.com/alastairlundy/CliInvoke"},{"type":"WEB","url":"https://github.com/alastairlundy/CliInvoke/releases/tag/2.10.5"},{"type":"WEB","url":"https://github.com/alastairlundy/CliInvoke/releases/tag/3.0.0-beta.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:54:29.634825323Z"}}