Summary
@anthropic-ai/claude-code v2.1.101 was classified as CRITICAL RISK with a risk score of 5995.5. Sigil detected 396 findings across 21 files, covering phases including install hooks, code patterns, network exfiltration, credential access, obfuscation, provenance. Review the findings below before installing this package.
v2.1.101
24 April 2026, 04:20 UTC
by Sigil Bot
Risk Score
5995.5
Findings
396
Files Scanned
21
Provenance
Findings by Phase
Phase Ordering
Phases are ordered by criticality, with the most dangerous at the top. Click any phase header to expand or collapse its findings. Critical phases are expanded by default.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
package/cli.js:446
See the troubleshooting guide for more information: https://aka.ms/azsdk/js/identity/azurepipelinescredential/troubleshoot`;throw Gb.error(_),new F4(_)}return Gb.info("Invoking getToken() of Client Assertion Credential"),this.clientAssertionCredential.getToken(q,K)}async requestOidcToken(q,K){Gb.info("Requesting OIDC token from Azure Pipelines..."),Gb.info(q);let _=IR({url:q,method:"POST",headers:ir({"Content-Type":"application/json",Authorization:`Bearer ${K}`,"X-TFS-FedAuthRedirect":"SupWhy was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
package/cli.js:3042
`+_.join(`
`)+`
}`}return z.toString=Y,z}je1.verbose=!1});var _3K=B((XJw,K3K)=>{K3K.exports=i78;var Biz=rs1(),Fiz=ss1(),He1=Fiz("fs");function i78(q,K,_){if(typeof K==="function")_=K,K={};else if(!K)K={};if(!_)return Biz(i78,this,q,K);if(!K.xhr&&He1&&He1.readFile)return He1.readFile(q,function(Y,A){return Y&&typeof XMLHttpRequest<"u"?i78.xhr(q,K,_):Y?_(Y):_(null,K.binary?A:A.toString("utf8"))});return i78.xhr(q,K,_)}i78.xhr=function(K,_,z){var Y=new XMLHttpRequest;if(Y.onreadystatechange=funWhy was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
package/cli.js:3055
`+K);let _;try{_=Xt.Metadata.fromHttp2Headers(q)}catch(A){_=new Xt.Metadata}let z=_.getMap(),Y;if(typeof z["grpc-status"]==="string"){let A=Number(z["grpc-status"]);this.trace("received status code "+A+" from server"),_.remove("grpc-status");let O="";if(typeof z["grpc-message"]==="string"){try{O=decodeURI(z["grpc-message"])}catch(w){O=z["grpc-message"]}_.remove("grpc-message"),this.trace('received status details string "'+O+'" from server')}Y={code:A,details:O,metadata:_}}else if(this.httpStatusWhy was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
package/cli.js:8556
If you cannot find a concrete e2e path, use the \`${DY}\` tool to ask the user how to verify this change end-to-end. Offer 2–3 specific options based on what you found (e.g., "Screenshot via chrome extension", "Run \`bun run dev\` and curl the endpoint", "No e2e — unit tests are sufficient"). Do not skip this — the workers cannot ask the user themselves.
Write the recipe as a short, concrete set of steps that a worker can execute autonomously. Include any setup (start a dev server, build Why was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
package/cli.js:1671
]`,`[\\[\\]\\.,\\+\\-<> \r
]`,{returnEnd:!0,relevance:0}),{className:"title",begin:"[\\[\\]]",relevance:0},{className:"string",begin:"[\\.,]",relevance:0},{begin:/(?:\+\+|--)/,contains:[K]},K]}}Lk4.exports=Uzz});var hk4=B((YG2,Sk4)=>{function gzz(q){if(!q)return null;if(typeof q==="string")return q;return q.source}function Qzz(q){return kQ1("(?=",q,")")}function tS8(q){return kQ1("(",q,")?")}function kQ1(...q){return q.map((_)=>gzz(_)).join("")}function dzz(q){let K=q.COMMENT("//","$",{contains:Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
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