CVE-2026-15793Network attack vector

Host command execution via option-like Git ref

Published Jul 21, 2026 · Updated Jul 21, 2026

Argument injection in Moby BuildKit 0.30.0 through 0.31.1 allows remote authenticated users to execute host commands via a malicious Git source. The Git source resolver accepts an option-like default branch from the remote HEAD symref and passes it to git fetch without an option terminator, so Git treats the ref as an executable --upload-pack argument. Exploitation requires a custom frontend or raw-API client to enable git.checkoutbundle=true and process the malicious source; current Dockerfile builds are not affected.

CVSS severity7.3
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Moby BuildKit 0.30.0 through 0.31.1 allows remote authenticated users to execute host commands via a malicious Git source. The Git source resolver accepts an option-like default branch from the remote HEAD symref and passes it to git fetch without an option terminator, so Git treats the ref as an executable --upload-pack argument. Exploitation requires a custom frontend or raw-API client to enable git.checkoutbundle=true and process the malicious source; current Dockerfile builds are not affected.

The record

CVE
CVE-2026-15793
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Moby Project
Product
BuildKit
Classifications
CWE-88, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.30.0 <=0.31.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moby Project · BuildKitversion=0.30.0 <=0.31.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.3Docker Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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