What’s Vulnerable › Vulnerabilities

CVE-2020-26895

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-21 · updated 2026-06-17
• Weakness: CWE-354

Description

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.

Affected products

• Lightning Network Daemon Project Lightning Network Daemon: 0.1-alpha, 0.1.1-alpha, 0.2-alpha, 0.2.1-alpha, 0.3-alpha, 0.4-beta (+48)

References

• 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
• 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

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