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VulnerabilityPublished

CVE-2026-77179: Docker Sandboxes · Link Following

Affects Docker SandboxesSource CVE Database V5

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Not known to be exploited · CVSS 9.4 Critical : upgrade to 0.42.0 as a priority.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 4.0 base score
9.4Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.42.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Docker Sandboxes and docker/sbx-releases to 0.42.0.

Affected software

ProductAffectedFixed in
DockerDocker SandboxesAffected
  • >=0.28.0 <0.42.0
Fixed in
  • 0.42.0
GitHubdocker/sbx-releasespkg:github/docker/sbx-releasesOther threatsAffected
  • >=0.28.0 <0.42.0
Fixed in
  • 0.42.0

CPE configurations (1)

  • cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, consider restricting untrusted guest access or limiting use of Docker Sandboxes on macOS environments where possible.

Description

On macOS, the virtio-fs host server used by Docker Sandboxes improperly follows symlinks when reopening an unlinked file from a stored path. A malicious guest can replace a parent directory with a symlink, escape the shared workspace, and read or modify arbitrary host files as the VMM user, potentially achieving host code execution.

References

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