Medium [CVE-2026-15788] Information Disclosure via Improper Handling of NTFS Directory Junctions
This medium-severity Red Hat Linux advisory covers CVE-2026-15788 affecting Red Hat Hardened Images.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.
A flaw was found in BuildKit. An untrusted user, when authoring a build on a Windows Container on Windows (WCOW) configured BuildKit daemon, can exploit a vulnerability in the cache mount source selector.
Red Hat severity: Moderate — CVSS 6.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N). Weakness: CWE-22.
Affected Red Hat products: Red Hat Hardened Images. Red Hat fixing advisory: RHSA-2026:43122, RHSA-2026:44152, RHSA-2026:46988, RHSA-2026:51065.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- buildah-main-1.44.0-3.2.hum1
- podman-main-6.0.2-2.1.hum1
- trivy-main-0.72.0-0.1.2.hum1
- buildah-main-1.45.0-2.hum1
- RHSA-2026:43122
- RHSA-2026:44152
- RHSA-2026:46988
- RHSA-2026:51065
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: buildah-main-1.44.0-3.2.hum1, podman-main-6.0.2-2.1.hum1, trivy-main-0.72.0-0.1.2.hum1, buildah-main-1.45.0-2.hum1, RHSA-2026:43122, RHSA-2026:44152. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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