{"id":562207,"date":"2026-09-13T16:55:14","date_gmt":"2026-09-13T15:55:14","guid":{"rendered":"https:\/\/cryptoslate.com\/?p=562207"},"modified":"2026-09-13T13:20:02","modified_gmt":"2026-09-13T12:20:02","slug":"critical-bitcoin-lightning-bugs-exposed-nodes-to-fund-theft-and-restart-failure","status":"publish","type":"post","link":"https:\/\/cryptoslate.com\/critical-bitcoin-lightning-bugs-exposed-nodes-to-fund-theft-and-restart-failure\/","title":{"rendered":"Critical Bitcoin Lightning bugs exposed nodes to fund theft and restart failure"},"content":{"rendered":"<p>Lightning Development Kit, a toolkit for building Bitcoin Lightning applications, released v0.2.6 on Sept. 9 with fixes for bugs that could divert small amounts of a node\u2019s funds or prevent saved channel state from loading.<\/p>\n<p><a href=\"https:\/\/lightningdevkit.org\/\">LDK<\/a> packages a Lightning implementation as a software development kit for uses including mobile wallets and payment-service infrastructure. The <a href=\"https:\/\/github.com\/lightningdevkit\/rust-lightning\/releases\/tag\/v0.2.6\">update<\/a> gives developers maintaining affected applications fixes for both a financial risk and a condition that can disrupt normal node restarts.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/onslaught-of-ai-found-bugs-forces-bitcoins-core-lightning-into-a-secret-14-day-emergency-lockdown\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Onslaught of AI-found bugs forces Bitcoin's Core Lightning into a secret 14-day emergency lockdown<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p>A splice lets a node add funds to or remove funds from an existing payment channel. LDK\u2019s <a href=\"https:\/\/docs.rs\/lightning\/latest\/lightning\/ln\/channelmanager\/struct.ChannelManager.html\">API documentation<\/a> describes this as spending the channel\u2019s funding output and replacing it with a new one. In practical terms, it changes the money committed to the channel through a replacement funding transaction.<\/p>\n<p>That transaction has costs shared between the participants. The initiating node pays fees for specified common parts, along with its own contributed inputs and outputs. The fee calculation therefore affects how much of the node\u2019s money pays for the operation.<\/p>\n<p>The splice flaw could let a malicious peer cause excess fee allocation, with the excess going to that peer\u2019s output. The release describes a small amount of funds at risk when a node initiates a splice, without specifying a numerical ceiling.<\/p>\n<p>The separate security flaw involved two payment contracts sharing the same payment hash. After one had been successfully forwarded, receiving and immediately rejecting a bogus one could leave ChannelManager state unable to load.<\/p>\n<p>ChannelManager is LDK\u2019s component for managing channels and payments. Restarting an existing node involves reading its saved state back into memory, a process called deserialization. If that saved state is rejected during loading, the application cannot complete its normal restart. Rejecting the bogus payment does not, by itself, avoid this particular failure.<\/p>\n<p><a href=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d.png\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-562208\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d.png\" alt=\"LDK v0.2.6, released September 9, 2026, fixes small splice-related fund diversion and a payment sequence that can prevent saved ChannelManager state from loading.\" width=\"720\" height=\"985\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d.png 1072w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d-219x300.png 219w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d-748x1024.png 748w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-d634bdff-11ec-49cc-abd9-1c3c9778425d-768x1051.png 768w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>For wallet builders, the two fixes address different parts of keeping a payment service running: allocating funds correctly when a channel changes and retaining state that can be loaded after a shutdown.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/boltzs-shutdown-shows-the-real-danger-of-ai-hacking-is-pushing-crypto-back-into-the-hands-of-giant-custodians\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Boltz\u2019s shutdown shows the real danger of AI hacking is pushing crypto back into the hands of giant custodians<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p>LDK\u2019s <a href=\"https:\/\/lightningdevkit.org\/introduction\/architecture\/\">architecture documentation<\/a> explains that its core implementation is compiled into applications. Developers choose the surrounding storage, wallet, networking and blockchain-monitoring components. Incorporating the patched toolkit into those applications is therefore the relevant maintenance step for affected integrations.<\/p>\n<p>The release notice reports no observed losses or exploited applications. Its description establishes the vulnerabilities and fixes, rather than a measured toll on users. With v0.2.6 available, the immediate task for affected application teams is to bring those fixes into the software they operate.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/bitcoin-core-lightning-docker-bug-leaves-node-operators-exposed-despite-showing-updated-version\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Bitcoin Core Lightning Docker bug leaves node operators exposed despite showing updated version<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>LDK v0.2.6 addresses small splice-related fund losses and a payment-handling flaw that could prevent saved channel state from loading.<\/p>\n","protected":false},"author":1264,"featured_media":562245,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77968,78564,60208],"tags":[81073,76769,77433],"prediction_market_topic":[],"post_folder":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.9 (Yoast SEO v21.9.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LDK 0.2.6 fixes Lightning fund diversion and restart bugs<\/title>\n<meta name=\"description\" content=\"LDK v0.2.6 patches Bitcoin Lightning flaws that could divert small amounts during splicing or stop saved channel state from loading.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cryptoslate.com\/critical-bitcoin-lightning-bugs-exposed-nodes-to-fund-theft-and-restart-failure\/\" \/>\n<meta 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