HOMEVULNERABILITIESCVE-2020-26895
MEDIUM

CVE-2020-26895

CWE-354Published: October 21, 2020· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-26895 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

lightning_network_daemon_project1 product(s)
lightning network daemon
Source: NVD CPE · 22 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://gist.github.com/ariard/fb432a9d2cd3ba24fdc18ccc8c5c6eb4
ADVISORYhttps://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002856.html
ADVISORYhttps://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002858.html
ADVISORYhttps://gist.github.com/ariard/fb432a9d2cd3ba24fdc18ccc8c5c6eb4
ADVISORYhttps://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002856.html
ADVISORYhttps://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002858.html

All References (6)

→
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

Quick Facts

CVE IDCVE-2020-26895
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-354
CISA KEVNo
Affected1 vendor(s)
PublishedOct 21, 2020

Related CVEs (CWE-354)

CVE-2017-15994
9.8
CVE-2025-11543
9.8
CVE-2023-28386
9.8
CVE-2023-33668
9.8
CVE-2026-34182
9.1
CVE-2022-29898
9.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-26895 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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