Prior to 0.10.0-beta, LND (Lightning Network Daemon) would have accepted a counterparty high-S signature and broadcast tx-relay invalid local commitment/HTLC transactions. This can be exploited by any peer with an open channel regardless of the victim situation (e.g., routing node, payment-receiver, or payment-sender). The impact is a loss of funds in certain situations.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26895
Reference (s):
- https://gist.github.com/ariard/fb432a9d2cd3ba24fdc18ccc8c5c6eb4
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002856.html
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002858.html