CVE-2020-26895
MEDIUMCVSS 5.3/10EPSS 0.70%
Last modified
CVE-2020-26895 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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). EPSS estimates a 0.70% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Lightning Network Daemon Project | Lightning Network Daemon | 0.1 | Alpha |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.1.1 | Alpha |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.2 | Alpha |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.2.1 | Alpha |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.3 | Alpha |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.4 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.4.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.4.2 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.5 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.5.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.5.2 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.6 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.6.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.7.0 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.7.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.8.0 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.8.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.8.2 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.9.0 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.9.1 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.9.2 | Beta |
| Lightning Network Daemon Project | Lightning Network Daemon | 0.10.0 | Beta Rc1 |
References
- https://gist.github.com/ariard/fb432a9d2cd3ba24fdc18ccc8c5c6eb4Third Party Advisory
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002856.htmlMailing List, Third Party Advisory
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002858.htmlMailing List, Third Party Advisory
- https://gist.github.com/ariard/fb432a9d2cd3ba24fdc18ccc8c5c6eb4Third Party Advisory
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002856.htmlMailing List, Third Party Advisory
- https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002858.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-26895?
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.
How severe is CVE-2020-26895?
CVE-2020-26895 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.
How do I fix CVE-2020-26895?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-26895?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST