{"id":12408,"date":"2026-08-26T13:43:12","date_gmt":"2026-08-26T13:43:12","guid":{"rendered":"https:\/\/cryptonews.uk.com\/?p=12408"},"modified":"2026-08-26T13:43:12","modified_gmt":"2026-08-26T13:43:12","slug":"old-lightning-nodes-may-be-exposed-to-a-full-channel-wipeout-after-lnd-fix-lands-later-than-disclosed","status":"publish","type":"post","link":"https:\/\/cryptonews.uk.com\/?p=12408","title":{"rendered":"Old Lightning nodes may be exposed to a full-channel wipeout after LND fix lands later than disclosed"},"content":{"rendered":"<p><\/p>\n<div data-single-article-content=\"\">\n<p>LND, a Lightning Network node implementation, has disclosed a channel-close flaw that can put an entire channel balance at risk in the reproduced maximum-loss scenario. Operators using standard releases below 0.21.0 should treat their nodes as lacking the official fix unless they were independently patched.<\/p>\n<p>The Aug. 13 disclosure describes how a malicious channel peer could combine a one-block Bitcoin reorganization with an old, revoked commitment transaction after a cooperative close. Bastien Teinturier, who published the disclosure, said no affected users were known.<\/p>\n<div class=\"cs-article-embed\">\n<p> <span class=\"cs-article-embed__related-reading\">Related Reading<\/span><\/p>\n<h3 class=\"cs-article-embed__title\">Researchers discover vulnerabilities in Bitcoin layer-2 Lightning Network<\/h3>\n<\/p>\n<p> <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\"> <i class=\"fa-light fa-arrow-up-right\"\/> <\/span> <\/div>\n<p>Before the fix, LND could forget a cooperatively closed channel after the closing transaction received its first on-chain confirmation. That removed the channel state the node needed to respond safely if Bitcoin later reorganized that block out of the chain.<\/p>\n<p>The attack requires more than an ordinary one-block reorganization. A malicious peer must first participate in the cooperative close, wait for one confirmation, and then take advantage of a reorganization that removes the closing transaction. The peer must also possess and publish an earlier revoked commitment, an outdated channel balance state that should trigger punishment.<\/p>\n<div class=\"cs-article-embed\">\n<p> <span class=\"cs-article-embed__related-reading\">Related Reading<\/span><\/p>\n<h3 class=\"cs-article-embed__title\">Inside Bitcoin\u2019s 24 hour race to survive a global internet blackout<\/h3>\n<\/p>\n<p> <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\"> <i class=\"fa-light fa-arrow-up-right\"\/> <\/span> <\/div>\n<p>An affected LND node can then fail to broadcast the penalty transactions designed to punish publication of that revoked state. Under the reproduced scenario, the loss can reach the channel&#8217;s full balance. That figure is a maximum loss condition, not evidence that the vulnerability was exploited in the wild.<\/p>\n<aside id=\"cs-inline-newsletter-1\" class=\"cs-inline-newsletter\" data-inline-newsletter=\"\" data-newsletter-placement=\"article-midpoint\" data-newsletter-pending-label=\"Joining\u2026\" data-newsletter-pending-status=\"Joining the Daily Brief\u2026\" data-newsletter-email-required-message=\"Before sending, please provide your email address.\" aria-labelledby=\"cs-inline-newsletter-1-title\" aria-describedby=\"cs-inline-newsletter-1-copy\">\n<div class=\"cs-inline-newsletter__inner\">\n<div class=\"cs-inline-newsletter__content\"> <span class=\"cs-inline-newsletter__eyebrow\"> <i class=\"fa-regular fa-envelope\" aria-hidden=\"true\"\/> The Daily Brief <\/span><\/p>\n<h2 id=\"cs-inline-newsletter-1-title\" class=\"cs-inline-newsletter__title\">The signal, before the noise.<\/h2>\n<p id=\"cs-inline-newsletter-1-copy\" class=\"cs-inline-newsletter__copy\">Start your day with the crypto stories moving markets, decoded by CryptoSlate\u2019s editors.<\/p>\n<\/div>\n<div class=\"cs-inline-newsletter__form-shell\">\n<p class=\"cs-inline-newsletter__form-heading\">One email. Everything that matters.<\/p>\n<p id=\"cs-inline-newsletter-1-privacy\" class=\"cs-inline-newsletter__privacy\">Free to join. Unsubscribe any time.<\/p>\n<p> <i class=\"fa-regular fa-circle-xmark\" aria-hidden=\"true\"\/> <span>Whoops, looks like there was a problem. Please try again.<\/span><\/p>\n<p> <i class=\"fa-regular fa-circle-check\" aria-hidden=\"true\"\/> <span><strong>You\u2019re on the list.<\/strong> Your next Daily Brief is on its way.<\/span><\/p>\n<\/div>\n<\/div>\n<\/aside>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-558026\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a55471a-cfba-4d9d-903e-edb20d0a2ffa.png\" alt=\"Six-step LND channel-close exploit sequence showing the one-block reorganization prerequisite, full-channel maximum loss, and upgrade cutoff at version 0.21.0.\" width=\"720\" height=\"1402\"\/><img decoding=\"async\" class=\"lazyload aligncenter wp-image-558026\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a55471a-cfba-4d9d-903e-edb20d0a2ffa.png\" alt=\"Six-step LND channel-close exploit sequence showing the one-block reorganization prerequisite, full-channel maximum loss, and upgrade cutoff at version 0.21.0.\" width=\"720\" height=\"1402\"\/><\/p>\n<p>The disclosure and fix are specific to LND. They do not suggest that other Lightning implementations share the same channel-close flaw.<\/p>\n<div class=\"cs-article-embed\">\n<p> <span class=\"cs-article-embed__related-reading\">Related Reading<\/span><\/p>\n<h3 class=\"cs-article-embed__title\">Exchange BTC Lightning channels break our favorite Bitcoin metric<\/h3>\n<\/p>\n<p> <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\"> <i class=\"fa-light fa-arrow-up-right\"\/> <\/span> <\/div>\n<h2>The official fix starts with LND 0.21.0<\/h2>\n<p>Upstream repository history places the official fix in 0.21.0, not the 0.20.0 version cited by the public disclosure.<\/p>\n<p>Pull request #10331 merged into the project&#8217;s master branch on Jan. 16, 2026. A backport to the 0.20.x branch was later reverted, and a subsequent documentation change said the improved cooperative-close confirmation logic had actually landed in 0.21.0. The project&#8217;s 0.21.0 release notes also associate the reorganization-safe close logic with that release line.<\/p>\n<p>Operators therefore should not rely on the disclosure&#8217;s 0.20.0 cutoff. Standard releases below 0.21.0 should be treated as lacking the official fix unless independently patched.<\/p>\n<p>LND&#8217;s security policy recommends the latest minor release of the newest major line an operator can support. As of Aug. 25, the project&#8217;s latest official package was lnd v0.21.2-beta, released Aug. 13.<\/p>\n<p>The fix makes LND retain close state while waiting for multiple confirmations and react to reorganization notifications instead of considering the channel resolved after one block.<\/p>\n<\/div>\n<p>Featured,Hacks,Lightning,Technology,BitcoinBitcoin#Lightning #nodes #exposed #fullchannel #wipeout #LND #fix #lands #disclosed1787751792<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LND, a Lightning Network node implementation, has disclosed a channel-close flaw that can put an entire channel balance at risk in the reproduced maximum-loss scenario. Operators using standard releases below 0.21.0 should treat their nodes as lacking the official fix unless they were independently patched. The Aug. 13 disclosure describes how a malicious channel peer<\/p>\n","protected":false},"author":1,"featured_media":12409,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[91,6400,532,1053,6520,1325,2661,6522,2900,6521],"class_list":["post-12408","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum","tag-bitcoin","tag-disclosed","tag-exposed","tag-fix","tag-fullchannel","tag-lands","tag-lightning","tag-lnd","tag-nodes","tag-wipeout"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Old Lightning nodes may be exposed to a full-channel wipeout after LND fix lands later than disclosed - Crypto News: Latest Cryptocurrency News and Analysis<\/title>\n<meta name=\"description\" content=\"Repository history places the official protection in 0.21.0, leaving earlier standard releases exposed unless separately patched.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cryptonews.uk.com\/?p=12408\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Old Lightning nodes may be exposed to a full-channel wipeout after LND fix lands later than disclosed\" \/>\n<meta property=\"og:description\" content=\"Repository history places the official protection in 0.21.0, leaving earlier standard releases exposed unless separately patched.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptonews.uk.com\/?p=12408\" \/>\n<meta property=\"og:site_name\" content=\"Crypto News: Latest Cryptocurrency News and Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-26T13:43:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/lnd-channel-zipper-flaw.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u884c\u653f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u884c\u653f\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408\",\"url\":\"https:\/\/cryptonews.uk.com\/?p=12408\",\"name\":\"Old Lightning nodes may be exposed to a full-channel wipeout after LND fix lands later than disclosed - Crypto News: Latest Cryptocurrency News and Analysis\",\"isPartOf\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/lnd-channel-zipper-flaw.jpg\",\"datePublished\":\"2026-08-26T13:43:12+00:00\",\"author\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\"},\"description\":\"Repository history places the official protection in 0.21.0, leaving earlier standard releases exposed unless separately patched.\",\"breadcrumb\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cryptonews.uk.com\/?p=12408\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408#primaryimage\",\"url\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/lnd-channel-zipper-flaw.jpg\",\"contentUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/lnd-channel-zipper-flaw.jpg\",\"width\":1280,\"height\":720},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12408#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cryptonews.uk.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Old Lightning nodes may be exposed to a full-channel wipeout after LND fix lands later than disclosed\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cryptonews.uk.com\/#website\",\"url\":\"https:\/\/cryptonews.uk.com\/\",\"name\":\"Crypto News: Latest Cryptocurrency News and Analysis\",\"description\":\"Latest Crypto &amp; 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