--- title: Mercury Layer Vulnerability Disclosures Report | daily.dev description: A detailed security disclosure report examining five validation vulnerabilities in the Mercury Layer Statechains protocol client libraries. Mercury is a... canonical: https://daily.dev/posts/mercury-layer-vulnerability-disclosures-report-odur0muyv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Mercury Layer Vulnerability Disclosures Report | daily.dev og:description: A detailed security disclosure report examining five validation vulnerabilities in the Mercury Layer Statechains protocol client libraries. Mercury is a... og:url: https://daily.dev/posts/mercury-layer-vulnerability-disclosures-report-odur0muyv og:image: https://api.daily.dev/og/posts/oDuR0mUYv.png og:image:alt: Mercury Layer Vulnerability Disclosures Report 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. # Mercury Layer Vulnerability Disclosures Report **[Conduition](https://daily.dev/sources/conduition)** · 20 min read · 0 upvotes · 0 comments ## Summary A detailed security disclosure report examining five validation vulnerabilities in the Mercury Layer Statechains protocol client libraries. Mercury is a Bitcoin off-chain transfer protocol using a semi-trusted blind server. The five vulnerabilities (VULN_1 through VULN_5) range from medium to high severity and stem from insufficient validation of backup transactions given by senders to receivers. The most critical bug (VULN_5) involves the use of max sequence numbers (0xFFFFFFFF) by default, which disables locktime enforcement on all Mercury backup transactions, allowing any previous statecoin holder to double-spend at any time. The report recommends immediate on-chain withdrawal of all statecoins and proposes a paradigm shift: receivers should reconstruct backup transactions from minimal data points rather than accepting fully serialized transactions from senders, eliminating entire classes of attacks. ## Full article daily.dev links to this article rather than hosting it. 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