Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

slackhq/nebula

              master @ 89178f4
            

Fixes

CVEs

CRITICAL

Peak severity

83.3%

Coverage

Highlights

Denial of Service: 9 prior fixes. Scrutinize any change in this area.

cert/cert.go: most-fixed (3 issues). Treat as high-risk during review.

14 high-severity fixes in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Auth Bypass: Multiple critical and high-severity bypasses stem from insufficient validation of certificate public keys, blocklist fingerprints, root constraints, and IP/subnet ranges, allowing attackers to forge or misuse certificates.

Denial of Service: Integer overflows in IPv6 extension header parsing and panics from malformed certificates, nil maps, or blocking SSH handshakes enable remote crashes and resource exhaustion.

Auth Bypass: Conntrack checks were performed before certificate/IP verification, allowing source IP spoofing, and blocklisted hosts could remain connected unless the disconnect_invalid flag was set.