Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
A security update for Red Hat Hardened Images addresses a vulnerability in BuildKit (CVE-2026-15788) that allows an untrusted user on a Windows Container on Windows (WCOW) configured BuildKit daemon to read arbitrary files from the host system due to improper handling of NTFS directory junctions. This leads to information disclosure. The issue is fixed in buildah version 1.44.0-3.2.hum1 for aarch64 and x86_64 architectures.
AI Analysis
Technical Summary
CVE-2026-15788 is a vulnerability in BuildKit used by Red Hat Hardened Images, specifically affecting the buildah RPMs version 1.44.0-3.2.hum1. An untrusted user authoring a build on a Windows Container on Windows configured BuildKit daemon can exploit a flaw in the cache mount source selector, allowing arbitrary file reads from the host system. This is due to improper handling of NTFS directory junctions, classified under CWE-22 (Path Traversal). The vulnerability leads to information disclosure but does not impact integrity or availability. Red Hat has released updated RPMs to address this issue.
Potential Impact
The vulnerability allows an attacker with local access to a BuildKit daemon configured for Windows Containers on Windows to read arbitrary files from the host system, resulting in information disclosure. There is no impact on integrity or availability. No known exploits are reported in the wild. The severity is rated medium by Red Hat.
Mitigation Recommendations
Red Hat has released updated buildah RPMs (version 1.44.0-3.2.hum1) that fix this vulnerability. Users should apply this update to mitigate the issue. No additional mitigations are specified or required beyond applying the official update.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Description
A security update for Red Hat Hardened Images addresses a vulnerability in BuildKit (CVE-2026-15788) that allows an untrusted user on a Windows Container on Windows (WCOW) configured BuildKit daemon to read arbitrary files from the host system due to improper handling of NTFS directory junctions. This leads to information disclosure. The issue is fixed in buildah version 1.44.0-3.2.hum1 for aarch64 and x86_64 architectures.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15788 is a vulnerability in BuildKit used by Red Hat Hardened Images, specifically affecting the buildah RPMs version 1.44.0-3.2.hum1. An untrusted user authoring a build on a Windows Container on Windows configured BuildKit daemon can exploit a flaw in the cache mount source selector, allowing arbitrary file reads from the host system. This is due to improper handling of NTFS directory junctions, classified under CWE-22 (Path Traversal). The vulnerability leads to information disclosure but does not impact integrity or availability. Red Hat has released updated RPMs to address this issue.
Potential Impact
The vulnerability allows an attacker with local access to a BuildKit daemon configured for Windows Containers on Windows to read arbitrary files from the host system, resulting in information disclosure. There is no impact on integrity or availability. No known exploits are reported in the wild. The severity is rated medium by Red Hat.
Mitigation Recommendations
Red Hat has released updated buildah RPMs (version 1.44.0-3.2.hum1) that fix this vulnerability. Users should apply this update to mitigate the issue. No additional mitigations are specified or required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:43122
- Cve Count
- 1
- State
- PUBLISHED
Threat ID: 6a74cf8fbf8831d5391aef0f
Added to database: 08/06/2026, 18:16:47 UTC
Last enriched: 09/13/2026, 15:05:49 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 32
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