--- title: HTTP desync in Discord's media proxy: Spying on a whole... description: A researcher discovered an HTTP injection vulnerability in Discord's media proxy (media.discordapp.net) in 2022. By injecting URL-encoded control characters... canonical: https://daily.dev/posts/http-desync-in-discord-s-media-proxy-spying-on-a-whole-platform-znjybsllc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: HTTP desync in Discord's media proxy: Spying on a whole platform | daily.dev og:description: A researcher discovered an HTTP injection vulnerability in Discord's media proxy (media.discordapp.net) in 2022. By injecting URL-encoded control characters... og:url: https://daily.dev/posts/http-desync-in-discord-s-media-proxy-spying-on-a-whole-platform-znjybsllc og:image: https://api.daily.dev/og/posts/ZNJybSLlc.png og:image:alt: HTTP desync in Discord's media proxy: Spying on a whole platform 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. # HTTP desync in Discord's media proxy: Spying on a whole platform **[Lobsters](https://daily.dev/sources/lobsters)** · 4 min read · 1 upvotes · 0 comments ## Summary A researcher discovered an HTTP injection vulnerability in Discord's media proxy (media.discordapp.net) in 2022. By injecting URL-encoded control characters (spaces, line feeds) into attachment URLs, they could corrupt the proxied HTTP request to the upstream GCP bucket. This enabled a full HTTP desync attack: by injecting a PUT request with an oversized Content-Length into a shared GCP connection pool, the next borrower's request would be captured as the PUT body — effectively leaking real-time attachment URLs from across the entire platform, including private DMs. The exploit was scalable with threading and earned a $3,500 bug bounty after being resolved within 10 days of reporting. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#discord](https://daily.dev/tags/discord) [View this post on daily.dev](https://daily.dev/posts/http-desync-in-discord-s-media-proxy-spying-on-a-whole-platform-znjybsllc) ```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":"HTTP desync in Discord's media proxy: Spying on a whole platform","url":"https://daily.dev/posts/http-desync-in-discord-s-media-proxy-spying-on-a-whole-platform-znjybsllc","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/http-desync-in-discord-s-media-proxy-spying-on-a-whole-platform-znjybsllc"},"datePublished":"2026-04-17T18:11:56.701Z","dateModified":"2026-04-17T18:12:23.021Z","description":"A researcher discovered an HTTP injection vulnerability in Discord's media proxy (media.discordapp.net) in 2022. 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