--- title: TryHackMe: Checkpoint Walkthrough | daily.dev description: A walkthrough of a TryHackMe premium CTF room called 'Checkpoint', where players evaluate four AI code review model candidates for production safety. The... canonical: https://daily.dev/posts/tryhackme-checkpoint-walkthrough-scldc6h0f twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: TryHackMe: Checkpoint Walkthrough | daily.dev og:description: A walkthrough of a TryHackMe premium CTF room called 'Checkpoint', where players evaluate four AI code review model candidates for production safety. The... og:url: https://daily.dev/posts/tryhackme-checkpoint-walkthrough-scldc6h0f og:image: https://api.daily.dev/og/posts/ScLDC6h0f.png og:image:alt: TryHackMe: Checkpoint Walkthrough og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # TryHackMe: Checkpoint Walkthrough **[InfoSec Write-ups](https://daily.dev/sources/infosecwriteups)** · 3 min read · 0 upvotes · 0 comments ## Summary A walkthrough of a TryHackMe premium CTF room called 'Checkpoint', where players evaluate four AI code review model candidates for production safety. The scenario involves identifying supply chain threats in ML models: one candidate (C) contains a malicious Keras lambda layer executing arbitrary code, another (D) uses an unverified external API with undisclosed provenance, and Candidate A reads /etc/passwd and has its security guardrail disabled while using an externally sourced 'CommunityReview' policy template. The walkthrough provides step-by-step answers including the final flag THM{supp1y_ch41n_0wn3d}, concluding that Candidate B is the only safe model for production. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [TryHackMe: Payload Walkthrough](https://daily.dev/posts/tryhackme-payload-walkthrough-fj72hwudl) · InfoSec Write-ups · 0 upvotes · 0 comments - [Publisher: TryHackMe CTF Walkthrough](https://daily.dev/posts/publisher-tryhackme-ctf-walkthrough-ksu6i6grg) · InfoSec Write-ups · 0 upvotes · 0 comments - [TryHackMe: Room 404 Walkthrough \(Hacker’s Holiday Challenge\)](https://daily.dev/posts/tryhackme-room-404-walkthrough-hacker-s-holiday-challenge--np3fgcqtz) · InfoSec Write-ups · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#machine-learning](https://daily.dev/tags/machine-learning), [#ai-security](https://daily.dev/tags/ai-security) [View this post on daily.dev](https://daily.dev/posts/tryhackme-checkpoint-walkthrough-scldc6h0f) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"TryHackMe: Checkpoint Walkthrough","url":"https://daily.dev/posts/tryhackme-checkpoint-walkthrough-scldc6h0f","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/tryhackme-checkpoint-walkthrough-scldc6h0f"},"datePublished":"2026-07-03T14:12:42.284Z","dateModified":"2026-07-03T14:24:11.272Z","description":"A walkthrough of a TryHackMe premium CTF room called 'Checkpoint', where players evaluate four AI code review model candidates for production safety. 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