CliInvoke: Argument Injection in Extensibility Runner Factory

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CliInvoke and its formerly named `AlastairLundy.CliInvoke` package are .NET libraries for invoking command-line programs and wrapping executable processes. `CliInvoke` versions 2.0.0 through 2.8.4, 2.9.0 through 2.9.3, 2.10.0 through 2.10.4, and 3.0.0-alpha.1 through 3.0.0-beta.1, as well as `AlastairLundy.CliInvoke` versions 2.0.0-alpha.1 through 2.0.0, contain an argument-injection vulnerability in `RunnerProcessFactory` on the 2.x line and `RunnerConfigurationFactory` on the 3.x line. These factories combine runner arguments, a caller-controlled target, and caller-controlled arguments into one `ProcessStartInfo.Arguments` string, allowing a double quote in the target or an argument to terminate an operating-system-level quoted region and inject unintended elements into the runner’s argument vector, potentially resulting in arbitrary command execution when a shell runner is used. The vulnerability is patched in `CliInvoke` versions 2.8.5, 2.9.4, 2.10.5, and 3.0.0-beta.2, and in `AlastairLundy.CliInvoke` version 2.0.2. No complete workaround is available; users unable to upgrade can partially mitigate the issue by removing double quotes from targets and arguments, additionally removing shell metacharacters when using shell runners, or bypassing the vulnerable factory and constructing a `ProcessConfiguration` with an explicit `ArgumentList`.

Source published

25 Sep 2026 20:26:51 UTC

Source modified

28 Sep 2026 13:42:58 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CliInvoke and its formerly named `AlastairLundy.CliInvoke` package are .NET libraries for invoking command-line programs and wrapping executable processes. `CliInvoke` versions 2.0.0 through 2.8.4, 2.9.0 through 2.9.3, 2.10.0 through 2.10.4, and 3.0.0-alpha.1 through 3.0.0-beta.1, as well as `AlastairLundy.CliInvoke` versions 2.0.0-alpha.1 through 2.0.0, contain an argument-injection vulnerability in `RunnerProcessFactory` on the 2.x line and `RunnerConfigurationFactory` on the 3.x line. These factories combine runner arguments, a caller-controlled target, and caller-controlled arguments into one `ProcessStartInfo.Arguments` string, allowing a double quote in the target or an argument to terminate an operating-system-level quoted region and inject unintended elements into the runner’s argument vector, potentially resulting in arbitrary command execution when a shell runner is used. The vulnerability is patched in `CliInvoke` versions 2.8.5, 2.9.4, 2.10.5, and 3.0.0-beta.2, and in `AlastairLundy.CliInvoke` version 2.0.2. No complete workaround is available; users unable to upgrade can partially mitigate the issue by removing double quotes from targets and arguments, additionally removing shell metacharacters when using shell runners, or bypassing the vulnerable factory and constructing a `ProcessConfiguration` with an explicit `ArgumentList`.

Source published

Sep 25, 2026, 8:26:51 PM (timezone not stated)

Source modified

Sep 28, 2026, 1:42:58 PM (timezone not stated)

Observed here

11 Nov 2026 04:39:46 UTC

Source terms

ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CliInvoke and its formerly named `AlastairLundy.CliInvoke` package are .NET libraries for invoking command-line programs and wrapping executable processes. `CliInvoke` versions 2.0.0 through 2.8.4, 2.9.0 through 2.9.3, 2.10.0 through 2.10.4, and 3.0.0-alpha.1 through 3.0.0-beta.1, as well as `AlastairLundy.CliInvoke` versions 2.0.0-alpha.1 through 2.0.0, contain an argument-injection vulnerability in `RunnerProcessFactory` on the 2.x line and `RunnerConfigurationFactory` on the 3.x line. These factories combine runner arguments, a caller-controlled target, and caller-controlled arguments into one `ProcessStartInfo.Arguments` string, allowing a double quote in the target or an argument to terminate an operating-system-level quoted region and inject unintended elements into the runner’s argument vector, potentially resulting in arbitrary command execution when a shell runner is used. The vulnerability is patched in `CliInvoke` versions 2.8.5, 2.9.4, 2.10.5, and 3.0.0-beta.2, and in `AlastairLundy.CliInvoke` version 2.0.2. No complete workaround is available; users unable to upgrade can partially mitigate the issue by removing double quotes from targets and arguments, additionally removing shell metacharacters when using shell runners, or bypassing the vulnerable factory and constructing a `ProcessConfiguration` with an explicit `ArgumentList`.

Source published

25 Sep 2026 21:17:21 UTC

Source modified

30 Sep 2026 19:57:08 UTC

Observed here

25 Oct 2026 04:17:26 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

### Impact An argument-injection vulnerability exists in the `CliInvoke` package's runner factory: `RunnerProcessFactory` on the 2.x line and `RunnerConfigurationFactory` on the 3.x line. The factory joins the runner arguments, the caller's target, and the caller's arguments into a single `ProcessStartInfo.Arguments` string and hands it to the OS. The OS command-line parser re-tokenizes the string before the runner sees it. A double quote (`"`) in the target or in any argument closes the OS-level quoted region and lets the next character enter argv as a separate element. ### Patches Upgrade to: - **2.8.5** (2.8.x line) - **2.9.4** (2.9.x line) - **2.10.5** (2.10.x line) - **3.0.0-beta.2** (3.x pre-release line) ### Workarounds No complete workaround is available. Until you can upgrade: - Strip `"` from any target or argument before passing it to the factory. On shell runners, also strip `;`, `|`, `&`, `$`, backtick, and parentheses. - Or bypass the factory entirely and build the `ProcessConfiguration` directly. Set `ArgumentList` explicitly to the argv you want the runner to receive. These are partial mitigations. They shift the quoting problem to your code.

Source published

25 Sep 2026 21:41:36 UTC

Source modified

25 Sep 2026 23:00:10 UTC

Observed here

23 Oct 2026 16:01:25 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Publisher rating · HIGH