CVE-2026-101303

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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - secteam@freebsd.org

Published

2026-10-15

Last modified

2026-10-20

Weaknesses

CWE-941

Affected products

• Freebsd (Freebsd)

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.asc