CVSS 4.0
7.6 highCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-25793
High (7.6) in slack nebula. EPSS 0.1% chance of exploitation in the next 30 days. Fixed in github.com/slackhq/nebula 1.10.3.
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.
Severity
CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N- EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 3% of CVEs (scores of 2026-10-31)
- CWE
- CWE-347
- Published
- Modified
- Record from
- the NVD, synced
Affected
- slack:nebula
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-69x3-g4r3-p962 | Go | github.com/slackhq/nebula | >=1.7.0 <1.10.3 | 1.10.3 |
| GO-2026-4458 | Go | github.com/slackhq/nebula | >=1.7.0 <1.10.3 | 1.10.3 |