CVE-2026-101303CWE-941

CVE-2026-101303

High · published October 15, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
28.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00363 · 28.9th percentile
Weakness
CWE-941 · Incorrectly Specified Destination in a Communication Channel
Published
2026-10-15T11:17Z
Affected products (29)
ProductVersionsFixed in
freebsd/freebsdall versions—
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freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
References (1)
https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.asc · [email protected]
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 15 OCT 06:58Z
    IPv6 UDP sendto(2) bypasses jail loopback restriction
    cvelistv5
  • 15 OCT 06:58Z
    IPv6 UDP sendto(2) bypasses jail loopback restriction
    cvelistv5