CVE-2026-101303
Last modified
CVE-2026-101303 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address. A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
Description
The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address. A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Freebsd | Freebsd | 14.4 |
| Freebsd | Freebsd | 14.5 |
| Freebsd | Freebsd | 15.0 |
| Freebsd | Freebsd | 15.1 |
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.ascPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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