How severe is CVE-2026-15791?

CVE-2026-15791 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-2026-15791 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-15791?

CVE-2026-15791 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-15791?

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-2026-15791 published?

CVE-2026-15791 was published on 2026-07-21 and last updated on 2026-07-30.

CVE-2026-15791

CVE-2026-15791 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: 1.8
EPSS exploit prediction: 0% (17th 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 crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.

Frequently asked questions

What is CVE-2026-15791?: A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.
How severe is CVE-2026-15791?: CVE-2026-15791 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-2026-15791 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-15791?: CVE-2026-15791 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-15791?: 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-2026-15791 published?: CVE-2026-15791 was published on 2026-07-21 and last updated on 2026-07-30.

References

https://github.com/moby/buildkit/security/advisories/GHSA-32pv-7hq5-qhwq

Affected products (1)

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

More vulnerabilities in Mobyproject Buildkit

CVE-2024-23652 — Critical (CVSS 10.0): BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner.…
CVE-2024-23653 — Critical (CVSS 9.8): BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner.…
CVE-2024-23651 — High (CVSS 8.7): BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner.…
CVE-2026-33747 — High (CVSS 8.4): BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner.…
CVE-2026-15793 — High (CVSS 7.5): BuildKit custom frontends or clients using the raw low-level API can set git.checkoutbundle=true when checking out Git…
CVE-2026-15792 — High (CVSS 7.5): A malicious BuildKit client or frontend could craft a request that could lead to BuildKit daemon crashing with a panic.

All CVEs affecting Mobyproject Buildkit →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.

Browse all CWE-22 (Path Traversal) vulnerabilities →