{"id":14262,"date":"2026-10-09T06:04:57","date_gmt":"2026-10-09T06:04:57","guid":{"rendered":"https:\/\/cryptonews.uk.com\/?p=14262"},"modified":"2026-10-09T06:04:57","modified_gmt":"2026-10-09T06:04:57","slug":"core-lightning-patches-critical-security-flaws-and-a-bitcoin-payment-bug","status":"publish","type":"post","link":"https:\/\/cryptonews.uk.com\/?p=14262","title":{"rendered":"Core Lightning patches critical security flaws and a Bitcoin payment bug"},"content":{"rendered":"<p><\/p>\n<div data-cs-editorial-figure-scope=\"\" data-cs-editorial-quote-scope=\"\" data-cs-image-viewer-scope=\"\" data-single-article-content=\"\">\n<p>Core Lightning, software for running Bitcoin Lightning payment nodes, has released v26.06.9 with security fixes and a repair for a regression that could delay channel traffic on busy nodes running v26.06.8.<\/p>\n<p>GitHub lists the new release as published Oct. 7, while its versioned changelog carries an Oct. 6 date.<\/p>\n<p>The update gives operators who installed v26.06.8 a fresh decision on upgrading, following the Sept. 27\u00a0revoked-channel penalty flaw that was fixed in v26.06.7. The latest patch adds fixes and addresses a regression introduced by that later version.<\/p>\n<h2>Bitcoin payment delays and shutdown risk<\/h2>\n<p>In v26.06.8, routine gossip, pings, and onion messages counted toward a CPU budget intended for gossip queries. On busy nodes, that accounting could throttle peers and delay channel traffic, according to the maintainers.<\/p>\n<p>V26.06.9 reserves that budget for gossip queries, so ordinary messages no longer consume it, removing the documented cause of this throttling. The regression described by maintainers concerns busy nodes running Core Lightning v26.06.8.<\/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\">Onslaught of AI-found bugs forces Bitcoin&#8217;s Core Lightning into a secret 14-day emergency lockdown<\/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>The changelog also describes a fix for a payment contract (HTLC) that reaches its deadline while a channel is shutting down. V26.06.9 now force-closes the channel in that situation, preventing forwarded funds from being lost if the payment is fulfilled late.<\/p>\n<p>For an operator forwarding payments, this fixes a funds-protection problem when payment deadlines and channel shutdown overlap.<\/p>\n<aside id=\"cs-inline-newsletter-1\" class=\"cs-inline-newsletter cs-newsletter-brand\" data-newsletter-edition=\"catalyst\" data-inline-newsletter=\"\" data-newsletter-placement=\"article-midpoint\" 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\">\n<div class=\"cs-inline-newsletter__editorial\">\n<p class=\"cs-inline-newsletter__eyebrow\">The Catalyst<\/p>\n<p class=\"cs-newsletter-frequency\">Daily Newsletter<\/p>\n<h2 id=\"cs-inline-newsletter-1-title\" class=\"cs-inline-newsletter__title\">Know what\u2019s moving crypto.<\/h2>\n<p id=\"cs-inline-newsletter-1-copy\" class=\"cs-inline-newsletter__copy\">Start with the stories that matter. Get the context behind the headlines and a clear view of what to watch next.<\/p>\n<\/div>\n<div class=\"cs-inline-newsletter__art\" aria-hidden=\"true\"> <img loading=\"lazy\" src=\"https:\/\/cryptoslate.com\/wp-content\/themes\/cryptoslate-2020\/images\/catalyst-newsletter-scrapbook-v3.webp\" alt=\"\" width=\"640\" height=\"640\" loading=\"lazy\" decoding=\"async\"\/><img loading=\"lazy\" class=\"lazyload\" src=\"https:\/\/cryptoslate.com\/wp-content\/themes\/cryptoslate-2020\/images\/catalyst-newsletter-scrapbook-v3.webp\" alt=\"\" width=\"640\" height=\"640\" loading=\"lazy\" decoding=\"async\"\/><\/div>\n<\/div>\n<\/div>\n<\/aside>\n<figure id=\"attachment_570170\" aria-describedby=\"caption-attachment-570170\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"shoggoth-infographic shoggoth-infographic-portrait wp-image-570170\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457.png\" alt=\"Core Lightning v26.06.9 comparison showing the v26.06.8 message-budget regression repair, shutdown protection for forwarded funds, and rune, configuration, disclosure and development-build details.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-768x960.png 768w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\"\/><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"lazyload shoggoth-infographic shoggoth-infographic-portrait wp-image-570170\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457.png\" alt=\"Core Lightning v26.06.9 comparison showing the v26.06.8 message-budget regression repair, shutdown protection for forwarded funds, and rune, configuration, disclosure and development-build details.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-c5ede5fc-a598-4d95-b057-589627123457-768x960.png 768w\" data-sizes=\"(max-width: 720px) 100vw, 720px\"\/><figcaption id=\"caption-attachment-570170\" class=\"wp-caption-text\">Core Lightning v26.06.9 fixes a message-budget regression and adds shutdown, permission, and configuration safeguards.<\/figcaption><\/figure>\n<p>Other fixes enforce the limits carried by runes used to authorize calls, so a restricted rune can no longer create an unrestricted one or relist blacklisted runes. Restrictions on the corresponding creation and blocklisting methods now also cover the <code>invokerune<\/code> and <code>destroyrune<\/code> aliases.<\/p>\n<p>The <code>listconfigs<\/code> command now masks several sensitive values, including recovery information and Bitcoin RPC passwords, for every caller. The <code>setconfig<\/code> command closes a path for injecting configuration lines through persistent option values.<\/p>\n<p>The fixes are available immediately, but maintainers have temporarily held back security tests to make exploit development harder and give operators more time to upgrade.<\/p>\n<p>Nodes that have run master cannot downgrade to a 26.06.x release because their database schema is newer. The release also reiterates that dual funding remains experimental and discourages zero-confirmation channels with untrusted peers.<\/p>\n<p>Maintainers urge Core Lightning users, including those on v26.06.8, to upgrade to v26.06.9 as soon as practical.<\/p>\n<\/div>\n<p>Featured,Lightning,Payments,Technology,Bitcoin,BTC,paymentsBitcoin,BTC,payments#Core #Lightning #patches #critical #security #flaws #Bitcoin #payment #bug1791525897<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Core Lightning, software for running Bitcoin Lightning payment nodes, has released v26.06.9 with security fixes and a repair for a regression that could delay channel traffic on busy nodes running v26.06.8. GitHub lists the new release as published Oct. 7, while its versioned changelog carries an Oct. 6 date. The update gives operators who installed<\/p>\n","protected":false},"author":1,"featured_media":14263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[91,285,4425,1362,158,6619,2661,4426,2015,167,1676],"class_list":["post-14262","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum","tag-bitcoin","tag-btc","tag-bug","tag-core","tag-critical","tag-flaws","tag-lightning","tag-patches","tag-payment","tag-payments","tag-security"],"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>Core Lightning patches critical security flaws and a Bitcoin payment bug - Crypto News: Latest Cryptocurrency News and Analysis<\/title>\n<meta name=\"description\" content=\"Core Lightning\u2019s latest update fixes Bitcoin payment delays, protects funds during channel shutdowns, and closes security flaws affecting node operators.\" \/>\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=14262\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Core Lightning patches critical security flaws and a Bitcoin payment bug\" \/>\n<meta property=\"og:description\" content=\"Core Lightning\u2019s latest update fixes Bitcoin payment delays, protects funds during channel shutdowns, and closes security flaws affecting node operators.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptonews.uk.com\/?p=14262\" \/>\n<meta property=\"og:site_name\" content=\"Crypto News: Latest Cryptocurrency News and Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-09T06:04:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/core-lightning-26069-security-standard.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1672\" \/>\n\t<meta property=\"og:image:height\" content=\"941\" \/>\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=14262\",\"url\":\"https:\/\/cryptonews.uk.com\/?p=14262\",\"name\":\"Core Lightning patches critical security flaws and a Bitcoin payment bug - Crypto News: Latest Cryptocurrency News and Analysis\",\"isPartOf\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=14262#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=14262#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/core-lightning-26069-security-standard.jpg\",\"datePublished\":\"2026-10-09T06:04:57+00:00\",\"author\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\"},\"description\":\"Core Lightning\u2019s latest update fixes Bitcoin payment delays, protects funds during channel shutdowns, and closes security flaws affecting node operators.\",\"breadcrumb\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=14262#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cryptonews.uk.com\/?p=14262\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=14262#primaryimage\",\"url\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/core-lightning-26069-security-standard.jpg\",\"contentUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/core-lightning-26069-security-standard.jpg\",\"width\":1672,\"height\":941},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=14262#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cryptonews.uk.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Core Lightning patches critical security flaws and a Bitcoin payment bug\"}]},{\"@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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