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CVE-2026-15789

Malicious client can bypass destination directory validation on local sources upload

HIGH
7.5
CVSS Score
Published: July 21, 2026 at 04:10 PM UTC
Updated: October 24, 2026 at 07:10 PM UTC
2 products affected across 2 vendorsBuildkitBuildKit

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Buildkit· Mobyproject
95%
v < 0.31.2
Affected range stops below 0.31.2, so it looks safe — our inference, not a vendor statement
BuildKit· Moby
90%
0 ≤ v < 0.31.2
Affected range stops below 0.31.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-22

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