CVE-2026-25793CWE-347

Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability

High · published February 6, 2026

CVSS v4.0
7.6
EPSS
0%
Percentile
7.5
In the wild
Unconfirmed
What it is

Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.

The record
Technical detail
CVSS v4.0
7.6 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00183 · 7.5th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-02-06T22:55Z
EPSS history
Timeline
  • 06 FEB 22:55Z
    Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
    cvelistv5