CVE-2020-26896

Name: CVE-2020-26896
Creator: NVD / NIST
Published: 2020-10-21T02:15:12.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2020-26896 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. Prior to 0.11.0-beta, LND (Lightning Network Daemon) had a vulnerability in its invoice database. While claiming on-chain a received HTLC output, it didn't verify that the corresponding outgoing off-chain HTLC was already settled before releasing the preimage. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

Prior to 0.11.0-beta, LND (Lightning Network Daemon) had a vulnerability in its invoice database. While claiming on-chain a received HTLC output, it didn't verify that the corresponding outgoing off-chain HTLC was already settled before releasing the preimage. In the case of a hash-and-amount collision with an invoice, the preimage for an expected payment was instead released. A malicious peer could have deliberately intercepted an HTLC intended for the victim node, probed the preimage through a colluding relayed HTLC, and stolen the intercepted HTLC. The impact is a loss of funds in certain situations, and a weakening of the victim's receiver privacy.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

0.73%

49.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-354

Affected Software

Vendor	Product	Versions
Lightning Network Daemon Project	Lightning Network Daemon	< 0.11.0
Lightning Network Daemon Project	Lightning Network Daemon	0.11.0

References

https://gist.github.com/ariard/6bdeb995565d1cc292753e1ee4ae402dThird Party Advisory
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002855.htmlMailing List, Third Party Advisory
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.htmlMailing List, Patch, Third Party Advisory
https://gist.github.com/ariard/6bdeb995565d1cc292753e1ee4ae402dThird Party Advisory
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002855.htmlMailing List, Third Party Advisory
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.htmlMailing List, Patch, Third Party Advisory

Timeline

Published: Oct 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26896?

How severe is CVE-2020-26896?

CVE-2020-26896 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26896?

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.

Are you affected by CVE-2020-26896?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST