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Fencer Vulns
high 8.2

CVE-2026-38651 json

Netmaker does not verify JWT signatures for host tokens

published 2026-04-28 6 mo ago modified 2026-06-25 4 mo ago also GHSA-qpv2-rwc8-c993 , GO-2026-5588 , EUVD-2026-26062

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Authentication Bypass vulnerability exists in Netmaker versions prior to 1.5.0. The VerifyHostToken function in logic/jwts.go fails to validate the JWT signature when verifying host tokens. An attacker can forge a JWT signed with any arbitrary key and use it to impersonate any host in the network, gaining access to sensitive information

Patch / fix

  • go github.com/gravitl/netmaker 1.5.0
  • netmaker netmaker 1.5.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • zyenra.com https://www.zyenra.com/blog/netmaker-jwt-verification-bypass referenced PoC, tagged "exploit" by a source, unverified
  • zyenra.com https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass/ referenced PoC, tagged "exploit" by a source, unverified
  • zyenra.com https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
GitHub 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/gravitl/netmaker
<1.5.0
1.5.0

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.