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Security Advisories: GSA_kwCzR0hTQS1oYzgyLXc5djgtODNwcs4AAv8P

Witness Block Parsing DoS Vulnerability


All lnd nodes before version v0.15.4 are vulnerable to a block parsing bug that can cause a node to enter a degraded state once encountered. In this degraded state, nodes can continue to make payments and forward HTLCs, and close out channels. Opening channels is prohibited, and also on chain transaction events will be undetected.

This can cause loss of funds if a CSV expiry is researched during a breach attempt or a CLTV delta expires forgetting the funds in the HTLC.


A patch is available starting with lnd v0.15.4.


Nodes can use the lncli updatechanpolicy RPC call to increase their CLTV value to a very high amount or increase their fee policies. This will prevent nodes from routing through your node, meaning that no pending HTLCs can be present.


Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 11 months ago
Updated: 8 months ago

CVSS Score: 8.2
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Identifiers: GHSA-hc82-w9v8-83pr, CVE-2022-39389

Affected Packages
Versions: < 0.15.4-beta
Fixed in: 0.15.4-beta