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Vulnerabilities

Vulnerability · CVE-2026-15789

A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory.

Published Jul 21, 2026 · catalog updated Oct 24, 2026 · A custom client can

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-15789. EPSS is 0.31%. Act only if a listed version of A custom client can is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A custom client can).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Version ranges on file
Affected products
cpe mobyproject/buildkit

A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mobyproject/buildkit< 0.31.2

How to fix CVE-2026-15789

  • Upgrade

    CVE-2026-15789 lists a fix boundary at 0.31.2. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 0.31.2

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-15789. EPSS is 0.31%. Act only if a listed version of A custom client can is installed.

Which versions are affected?

Compare what you have installed with < 0.31.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 21, 2026 · NIST NVD

    Detected

    A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.

  2. Oct 24, 2026 · NIST NVD

    Updated

    A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.

Sources

  • CVE.orgVulnerability recordCVE-2026-15789

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-15789

    A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 24, 2026
  • NIST NVDOct 24, 2026