What’s Vulnerable › Vulnerabilities
CVE-2026-101303: IPv6 UDP sendto(2) bypasses jail loopback restriction
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-15 · updated 2026-10-20
- Weakness: CWE-941
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.
Affected products
- FreeBSD: 14.4, 14.4-p1, 14.4-p2, 14.4-p3, 14.4-p4, 14.4-p5 (+23)
References
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