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CVE-2026-79994

Docker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink race

8.7 High

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.14%Unchanged since Sep 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Docker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink race

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
CVE-2026-79994
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Weakness
CWE-367
Updated
2026-11-02
EUVDEUVD-2026-79951 8.7

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
EUVD-2026-79951
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-wq46-97v9-q386 8.7

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is...

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
GHSA-wq46-97v9-q386
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-367
Updated
2026-11-02
NVD 8.7

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
CVE-2026-79994
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-367
Updated
2026-11-02
OSV 8.7

Docker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink race

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
CVE-2026-79994
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Weakness
CWE-367
Updated
2026-11-02
OSVUBUNTU-CVE-2026-79994 8.7

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Record
UBUNTU-CVE-2026-79994
CVSS 4.0
8.7 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
docker.io
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.6.2~dfsg1-1ubuntu41.10.2-0ubuntu31.10.2-0ubuntu41.10.3-0ubuntu11.10.3-0ubuntu4
Show 19 moreShow less
1.10.3-0ubuntu51.10.3-0ubuntu61.11.2-0ubuntu5~16.041.12.1-0ubuntu13~16.04.11.12.3-0ubuntu4~16.04.21.12.6-0ubuntu1~16.04.11.13.1-0ubuntu1~16.04.217.03.2-0ubuntu2~16.04.118.06.1-0ubuntu1~16.04.218.06.1-0ubuntu1.2~16.04.118.09.2-0ubuntu1~16.04.118.09.5-0ubuntu1~16.04.218.09.7-0ubuntu1~16.04.118.09.7-0ubuntu1~16.04.418.09.7-0ubuntu1~16.04.518.09.7-0ubuntu1~16.04.618.09.7-0ubuntu1~16.04.718.09.7-0ubuntu1~16.04.9+esm118.09.7-0ubuntu1~16.04.9+esm2
None known
docker.io
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.13.1-0ubuntu617.03.2-0ubuntu117.03.2-0ubuntu317.03.2-0ubuntu517.12.1-0ubuntu1
Show 22 moreShow less
18.06.1-0ubuntu1~18.04.118.06.1-0ubuntu1.2~18.04.118.09.2-0ubuntu1~18.04.118.09.5-0ubuntu1~18.04.218.09.7-0ubuntu1~18.04.118.09.7-0ubuntu1~18.04.318.09.7-0ubuntu1~18.04.419.03.6-0ubuntu1~18.04.119.03.6-0ubuntu1~18.04.219.03.6-0ubuntu1~18.04.320.10.2-0ubuntu1~18.04.220.10.2-0ubuntu1~18.04.320.10.7-0ubuntu1~18.04.120.10.7-0ubuntu1~18.04.220.10.7-0ubuntu5~18.04.220.10.7-0ubuntu5~18.04.320.10.12-0ubuntu2~18.04.120.10.21-0ubuntu1~18.04.220.10.21-0ubuntu1~18.04.320.10.21-0ubuntu1~18.04.3+esm120.10.21-0ubuntu1~18.04.3+esm220.10.21-0ubuntu1~18.04.3+esm3
None known
docker.io
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
19.03.2-0ubuntu119.03.6-0ubuntu119.03.8-0ubuntu119.03.8-0ubuntu1.20.0419.03.8-0ubuntu1.20.04.1
Show 15 moreShow less
19.03.8-0ubuntu1.20.04.220.10.2-0ubuntu1~20.04.220.10.2-0ubuntu1~20.04.320.10.7-0ubuntu1~20.04.120.10.7-0ubuntu1~20.04.220.10.7-0ubuntu5~20.04.120.10.7-0ubuntu5~20.04.220.10.12-0ubuntu2~20.04.120.10.21-0ubuntu1~20.04.120.10.21-0ubuntu1~20.04.220.10.21-0ubuntu1~20.04.420.10.21-0ubuntu1~20.04.520.10.21-0ubuntu1~20.04.620.10.21-0ubuntu1~20.04.6+esm120.10.21-0ubuntu1~20.04.6+esm2
None known
docker.io-app
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
20.10.25-0ubuntu1~20.04.120.10.25-0ubuntu1~20.04.224.0.5-0ubuntu1~20.04.124.0.7-0ubuntu2~20.04.126.1.3-0ubuntu1~20.04.126.1.3-0ubuntu1~20.04.1+esm126.1.3-0ubuntu1~20.04.1+esm2
None known
docker.io
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
20.10.7-0ubuntu520.10.7-0ubuntu720.10.12-0ubuntu120.10.12-0ubuntu220.10.12-0ubuntu3
Show 11 moreShow less
20.10.12-0ubuntu3+gke1.24.120.10.12-0ubuntu420.10.21-0ubuntu1~22.04.220.10.21-0ubuntu1~22.04.320.10.21-0ubuntu1~22.04.520.10.21-0ubuntu1~22.04.620.10.21-0ubuntu1~22.04.720.10.21-0ubuntu1~22.04.7+esm120.10.21-0ubuntu1~22.04.7+esm220.10.21-0ubuntu1~22.04.820.10.21-0ubuntu1~22.04.8+esm1
None known
docker.io-app
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
20.10.25-0ubuntu1~22.04.120.10.25-0ubuntu1~22.04.224.0.5-0ubuntu1~22.04.124.0.7-0ubuntu2~22.04.126.1.3-0ubuntu1~22.04.1
Show 6 moreShow less
26.1.3-0ubuntu1~22.04.1+esm127.5.1-0ubuntu3~22.04.127.5.1-0ubuntu3~22.04.228.2.2-0ubuntu1~22.04.129.1.3-0ubuntu3~22.04.129.1.3-0ubuntu3~22.04.2
None known
docker.io
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
20.10.24+dfsg1-1ubuntu220.10.25+dfsg1-2ubuntu120.10.25+dfsg1-2ubuntu1+esm120.10.25+dfsg1-2ubuntu1+esm220.10.25+dfsg1-2ubuntu1.24.04.120.10.25+dfsg1-2ubuntu1.24.04.1+esm1
None known
docker.io-app
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
24.0.5-0ubuntu124.0.7-0ubuntu124.0.7-0ubuntu224.0.7-0ubuntu324.0.7-0ubuntu4
Show 8 moreShow less
24.0.7-0ubuntu4.126.1.3-0ubuntu1~24.04.126.1.3-0ubuntu1~24.04.1+esm127.5.1-0ubuntu3~24.04.127.5.1-0ubuntu3~24.04.228.2.2-0ubuntu1~24.04.129.1.3-0ubuntu3~24.04.129.1.3-0ubuntu3~24.04.2
None known
docker.io
Ubuntu:26.10
All versions, plus listed versions
27.5.1+dfsg4-2ubuntu128.5.2+dfsg4-5ubuntu1
None known
docker.io-app
Ubuntu:26.10
All versions, plus listed versions
29.1.3-0ubuntu429.1.3-0ubuntu529.1.3-0ubuntu629.7.2-0ubuntu1
None known
docker.io
Ubuntu:26.04:LTS
All versions, plus listed versions
26.1.5+dfsg1-9ubuntu127.5.1+dfsg4-1ubuntu127.5.1+dfsg4-2ubuntu1
None known
docker.io-app
Ubuntu:26.04:LTS
All versions, plus listed versions
28.2.2-0ubuntu129.1.2-0ubuntu129.1.3-0ubuntu129.1.3-0ubuntu229.1.3-0ubuntu329.1.3-0ubuntu429.1.3-0ubuntu4.1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-79994 is a high vulnerability (CVSS 8.7) in Docker Sandboxes, published September 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. No source names a fixed version.

References

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