CVE-2020-26896: Prior to 0.11.0-beta, LND (Lightning Network Daemon) had a vulnerability in its invoice database

Q: How do I fix CVE-2020-26896?

lightning network daemon: upgrade to 0.11.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-26896 being exploited?

CVE-2020-26896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-26896 affect?

CVE-2020-26896 affects lightning network daemon. Severity is high (CVSS 8.2). 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 rel

Q: How urgent is CVE-2020-26896?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.2REMOTEUPGRADE

CVE-2020-26896 is a high-severity flaw (CVSS 8.2) affecting lightning network daemon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-354
Published	2020-10-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lightning network daemon project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-21 02:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

lightning network daemon project lightning network daemon UPGRADE

Affected: < 0.11.0 · 0.11.0 · 0.11.0 beta_rc1 · 0.11.0 beta_rc2 · 0.11.0 beta_rc3 · 0.11.0 beta_rc4

Fixed in: 0.11.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lightning-network-daemon || rpm -q lightning-network-daemon || lightning-network-daemon --version

2. UPGRADE to 0.11.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lightning-network-daemon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lightning-network-daemon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-26896?

lightning network daemon: upgrade to 0.11.0. Exact commands for each OS are on this page.

Is CVE-2020-26896 being exploited?

CVE-2020-26896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-26896 affect?

CVE-2020-26896 affects lightning network daemon. Severity is high (CVSS 8.2). 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 rel

How urgent is CVE-2020-26896?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-39389 HIGH 8.2 UPGRADE UPGRADE Lightning Network Daemon (lnd) is an implementation of a lightning bitcoin overlay network node
CVE-2021-41593 HIGH 8.6 UPGRADE Lightning Labs lnd before 0.13.3-beta allows loss of funds because of dust HTLC exposure.
CVE-2020-26895 MEDIUM 5.3 DOWNGRADE Prior to 0.10.0-beta, LND (Lightning Network Daemon) would have accepted a counterparty high-S signature and b

References

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