EUVD-2026-52481
GHSA-rm7q-w9c9-27rj
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack executes locally only when a user runs 's init' with a crafted argument (AV:L, UI:R); no prior privileges needed (PR:N); shell command execution yields full C/I/A impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
The "s init" command in Serverless-Devs @serverless-devs/s <= 3.1.11 passes unsanitized user input to child_process.spawn() with shell: true. A URL ending in ".git" bypasses the only input check, allowing OS command injection when a user runs "s init" with an attacker-controlled argument.
AnalysisAI
OS command injection in the Serverless-Devs CLI (@serverless-devs/s versions 3.1.11 and earlier) lets an attacker execute arbitrary commands on a developer's machine when they run 's init' with a crafted, attacker-influenced argument. The tool passes unsanitized input into child_process.spawn() with shell:true, and the single guard check - requiring the value to end in '.git' - is trivially satisfied by an attacker while still smuggling shell metacharacters. Publicly available exploit code exists (a proof-of-concept gist), SSVC rates technical impact as total and automatable, but EPSS remains low at 0.48% and it is not in CISA KEV.
Technical ContextAI
Serverless-Devs is an open-source serverless application lifecycle/DevOps toolchain (widely associated with the Alibaba Cloud Function Compute ecosystem) whose 's' CLI scaffolds projects via the 's init' command. The root cause is CWE-78 (Improper Neutralization of Special Elements used in an OS Command): user-supplied input is forwarded to Node.js child_process.spawn() with the shell:true option, which routes the arguments through '/bin/sh -c' (or cmd.exe) rather than executing a program directly. Because a shell interprets metacharacters such as ';', '&&', '|', backticks and '$()', any injected sequence is executed. The only validation is a check that the argument ends with '.git', which does not neutralize shell syntax - a payload like 'https://x/$(malicious).git' both passes the check and executes.
RemediationAI
Upgrade @serverless-devs/s to a fixed release above 3.1.11 once published; no exact patched version is provided in the available data, so confirm the fixed version directly with the maintainers before deploying - no vendor-released patch version is independently confirmed here. Until a fix is verified, do not run 's init' with untrusted or attacker-supplied repository URLs/template arguments, and treat any '.git' argument from an unverified source as dangerous despite the extension check. Compensating controls: pin and vet the exact template/registry sources you pass to 's init'; run the CLI inside an unprivileged, sandboxed container or throwaway VM so that command execution cannot reach credentials, cloud tokens, or CI secrets (trade-off: added workflow friction); and remove cached cloud credentials from the environment where the CLI runs to limit blast radius. Reference: the POC gist (https://gist.github.com/j311yl0v3u/5600afea3bea1337805c2e335bd4ae8e) and NVD (https://nvd.nist.gov/vuln/detail/CVE-2026-51190).
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Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
Leaving vuln.today