How severe is CVE-2026-15789?

CVE-2026-15789 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-15789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-15789?

CVE-2026-15789 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-15789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-15789 published?

CVE-2026-15789 was published on 2026-07-21 and last updated on 2026-07-30.

CVE-2026-15789

CVE-2026-15789 is a high-severity vulnerability in Mobyproject Buildkit with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.9
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Mobyproject Buildkit
Published: 2026-07-21
Last modified: 2026-07-30

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.

Frequently asked questions

What is 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. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.
How severe is CVE-2026-15789?: CVE-2026-15789 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-15789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-15789?: CVE-2026-15789 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-15789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-15789 published?: CVE-2026-15789 was published on 2026-07-21 and last updated on 2026-07-30.

References

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

Affected products (1)

cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:*

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