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Core Lightning patches critical security flaws and a Bitcoin payment bug

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Core Lightning patches critical security flaws and a Bitcoin payment bug

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 v26.06.8 a fresh decision on upgrading, following the Sept. 27 revoked-channel penalty flaw that was fixed in v26.06.7. The latest patch adds fixes and addresses a regression introduced by that later version.

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.

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.

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.

For an operator forwarding payments, this fixes a funds-protection problem when payment deadlines and channel shutdown overlap.

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 invokerune and destroyrune aliases.


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